What is JavaScript

JavaScript is a high-level, interpreted programming language that is used to create interactive and dynamic effects on web pages. It is often used to create client-side scripts that run directly in a user’s web browser. JavaScript was first introduced in 1995 and has since become one of the most widely used programming languages on the web. It is commonly used for tasks such as form validation, creating dynamic navigation menus, and creating interactive animations and effects. JavaScript is also used on the server-side through technologies such as Node.js.

// Define a function to display a greeting message
function greet(name) {
    console.log("Hello, " + name + "!");
}
// Call the function to display a greeting message
greet("John");

In this example, we define a function called greet that takes a name parameter and logs a greeting message to the console using the console.log() function. We then call the greet function and pass it the string “John” as the name parameter. When the program is executed, the console will display the message “Hello, John!”.