diff --git a/challenge 1/index.html b/challenge 1/index.html
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--- /dev/null
+++ b/challenge 1/index.html	
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+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Approximate Search - Challenge 1</title>
+    <style>
+      body {
+        font-family: Arial, sans-serif;
+        margin: 2rem;
+      }
+      h1{
+        text-align: center;
+        font-size: 60px;
+        color:rgb(110, 74, 74);
+      }
+      input {
+        padding: 0.9rem;
+        width: 98%;
+        margin-bottom: 1rem;
+        border: 1px solid #ccc;
+        border-radius: 4px;
+        font-size: 25px;
+      }
+      .suggestions {
+        list-style: none;
+        padding: 0;
+      }
+      .suggestions li {
+        padding: 0.5rem;
+        border-bottom: 1px solid #ddd;
+      }
+    </style>
+  </head>
+  <body>
+    <h1>Approximate Search - Challenge 1</h1>
+    <input type="text" id="searchInput" placeholder="Type a word..." />
+    <ul id="suggestions" class="suggestions"></ul>
+
+    <script>
+      const words = [
+        "absolutely",
+        "active",
+        "activity",
+        "activist",
+        "accurate",
+        "abstract",
+        "accessible",
+        "accessible",
+      ];
+
+      // Levenshtein Distance function
+      const levenshtein = (a, b) => {
+        const dp = Array(b.length + 1)
+          .fill()
+          .map((_, i) => i);
+        for (let i = 1; i <= a.length; i++) {
+          let prev = i;
+          for (let j = 1; j <= b.length; j++) {
+            const temp = dp[j];
+            dp[j] =
+              a[i - 1] === b[j - 1]
+                ? prev
+                : Math.min(dp[j - 1], dp[j], prev) + 1;
+            prev = temp;
+          }
+        }
+        return dp[b.length];
+      };
+
+      // Event listener for input
+      document
+        .getElementById("searchInput")
+        .addEventListener("input", function () {
+          const input = this.value.trim();
+          const suggestionsList = document.getElementById("suggestions");
+          suggestionsList.innerHTML = ""; // Clear current suggestions
+
+          if (input) {
+            const suggestions = words
+              .map((word) => ({ word, dist: levenshtein(input, word) }))
+              .sort((a, b) => a.dist - b.dist)
+              .slice(0, 3)
+              .map((item) => item.word);
+
+            suggestions.forEach((suggestion) => {
+              const li = document.createElement("li");
+              li.textContent = suggestion;
+              suggestionsList.appendChild(li);
+            });
+          }
+        });
+    </script>
+  </body>
+</html>
diff --git a/challenge 1/wordList.txt b/challenge 1/wordList.txt
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--- /dev/null
+++ b/challenge 1/wordList.txt	
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+absolutely active activity activist accurate abstract accessible achievable action adapt adore agile align alien amplify ambition anecdote komal
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diff --git a/challenge 2/index.html b/challenge 2/index.html
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--- /dev/null
+++ b/challenge 2/index.html	
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+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Arithmetic Expression Solver - Challenge 2</title>
+  </head>
+  <body>
+    <h1>Arithmetic Expression Solver - Challenge 2</h1>
+    <input type="file" id="fileInput" accept=".txt" />
+    <button onclick="processFile()">Solve Expressions</button>
+    <a id="downloadLink" style="display: none">Download Result</a>
+
+    <script>
+      function isValidExpression(expr) {
+        return /^[0-9+\-*/^().\[\]{} ]+$/.test(expr);  //regex expression
+      }
+
+      function cleanExpression(expr) {
+        expr = expr.replace(/–|—/g, "-");
+        expr = expr.replace(/(\d)\(/g, "$1*(");
+        expr = expr.replace(/\)(\d)/g, ")*$1");
+        expr = expr.replace(/\)\(/g, ")*(");
+
+        return expr;
+      }
+
+      function evaluateExpression(expr) {
+        try {
+          expr = expr.replace(/\^/g, "**");
+          return Function(`"use strict"; return (${expr});`)();
+        } catch (e) {
+          return "Invalid Expression";
+        }
+      }
+
+      function processFile() {
+        const fileInput = document.getElementById("fileInput");
+        if (fileInput.files.length === 0) {
+          alert("Please select a file.");
+          return;
+        }
+
+        const file = fileInput.files[0];
+        const reader = new FileReader();
+
+        reader.onload = function () {
+          const lines = reader.result.split("\n");
+          const outputLines = [];
+
+          lines.forEach((line) => {
+            line = line.trim();
+            if (line.endsWith("=")) {
+              const expression = cleanExpression(line.slice(0, -1).trim());
+              if (isValidExpression(expression)) {
+                const result = evaluateExpression(expression);
+                outputLines.push(`${line} ${result}`);
+              } else {
+                outputLines.push(`${line} Invalid Expression`);
+              }
+            } else {
+              outputLines.push(`${line} Invalid Expression`);
+            }
+          });
+
+          // output file for download
+          const outputContent = outputLines.join("\n");
+          const blob = new Blob([outputContent], { type: "text/plain" });
+          const url = URL.createObjectURL(blob);
+          const downloadLink = document.getElementById("downloadLink");
+          downloadLink.href = url;
+          downloadLink.download = "output.txt";
+          downloadLink.style.display = "block";
+          downloadLink.textContent = "Download Result File";
+        };
+
+        reader.readAsText(file);
+      }
+    </script>
+  </body>
+</html>
diff --git a/challenge 2/input.txt b/challenge 2/input.txt
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--- /dev/null
+++ b/challenge 2/input.txt	
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+10 – 2 =
+100 * ( 2 + 12 ) =
+(10 + 5^2) ( (5*-2) + 9 - 3^3) / 2 =
diff --git a/challenge 3/README.md b/challenge 3/README.md
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--- /dev/null
+++ b/challenge 3/README.md	
@@ -0,0 +1,5 @@
+# Start Guide
+
+Initialize npm and Install Dependencies:
+Run npm init -y to initialize a new npm project with default settings.
+Install nodemailer by running npm install nodemailer.
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diff --git a/challenge 3/komal_kafaltiya.png b/challenge 3/komal_kafaltiya.png
new file mode 100644
index 0000000..8bf28ec
Binary files /dev/null and b/challenge 3/komal_kafaltiya.png differ
diff --git a/challenge 3/sendEmail.js b/challenge 3/sendEmail.js
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--- /dev/null
+++ b/challenge 3/sendEmail.js	
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+const nodemailer = require('nodemailer');
+const fs = require('fs');
+const path = require('path');
+
+// Sender and receiver information
+const senderEmail = 'komalkafaltiya2555@gmail.com';
+const senderPassword = 'password';      // due to security reaosn i am not putting my email address here
+const receiverEmail = 'hr@ignitershub.com';
+
+// Email content
+const subject = 'Challenge 3 Completed';
+const body = `
+Name: Komal Kafaltiya
+Semester: 4
+Branch: CS-IT
+Roll Number: 21256342
+`;
+
+const imagePath = './komal_kafaltiya.png';
+const validImageTypes = ['.png', '.jpg', '.jpeg'];
+const imageExtension = path.extname(imagePath).toLowerCase();
+
+if (!fs.existsSync(imagePath)) {
+    console.error('Image file not found at the specified path.');
+    process.exit(1);
+}
+
+if (!validImageTypes.includes(imageExtension)) {
+    console.error('Invalid image type. Only PNG, JPG, JPEG are allowed.');
+    process.exit(1);
+}
+
+const transporter = nodemailer.createTransport({
+    service: 'gmail',
+    auth: {
+        user: senderEmail,
+        pass: senderPassword,
+    },
+});
+
+const mailOptions = {
+    from: senderEmail,
+    to: receiverEmail,
+    subject: subject,
+    text: body,
+    attachments: [
+        {
+            filename: path.basename(imagePath),
+            path: imagePath,
+        },
+    ],
+};
+
+// Send mail with defined transport object
+transporter.sendMail(mailOptions, (error, info) => {
+    if (error) {
+        return console.error('An error occurred while sending the email:', error);
+    }
+    console.log('Email sent successfully! Message ID:', info.messageId);
+});
+
+
+
diff --git a/challenge 4/index.html b/challenge 4/index.html
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--- /dev/null
+++ b/challenge 4/index.html	
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+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title> Palindrome Checker - Challenge 4</title>
+    <style>
+        h1 {
+            text-align: center;
+            color: skyblue;
+            font-size: 70px;
+        }   
+        button{
+            display: block;
+            margin:0 auto;
+            padding: 10px 40px;
+            font-size: 25px;
+            color:grey;
+            background-color:aliceblue;
+            border: 1px solid black;
+        }
+        #result{
+            font-size: 25px;
+            text-align: center;
+        }
+    </style>
+</head>
+
+<body>
+    <h1> Palindrome Checker - Challenge 4 </h1>
+        <button onclick="checkPalindrome()"> Check </button>
+        <p id="result"> </p>
+
+    <script>
+        function checkPalindrome() {
+            var word = prompt("Enter any String:");
+            var letters = word.split("");
+            var reversedLetters = letters.reverse();
+            var joinWord = reversedLetters.join("");
+
+            if (joinWord.toLowerCase() == word.toLowerCase()) {
+                document.getElementById("result").innerText = "The given word is a palindrome";
+            }
+            else {
+                document.getElementById("result").innerText = "The given word is not a palindrome";
+            }
+        }
+    </script>
+</body>
+
+</html>
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