In traditional web forms, validation occurred on the server after submission, leading to delays and server load. JavaScript allows for client-side form validation, checking data before it's sent to the server. Basic Form Validation Basic validation ensures required fields are filled and formats are correct: <form action="/cgi-bin/test.cgi" name="myForm" onsubmit="return validate()"> <input type="text" name="Name" /> <input type="text" name="EMail" /> <input type="text" name="Zip" /> <select name="Country"> <option value="-1" selected>[choose yours]</option> <option value="1">USA</option> <option value="2">UK</option> <option value="3">INDIA</option> </select> <input type="submit" val