How to create a variable in JavaScript?

To create a variable in JavaScript, you can use the var, let, or const keyword followed by the variable name. Here's the syntax for each:

var: It is the older way of declaring a variable, but it is still commonly used.

var variableName = value;

let: Introduced in ES6, let is block-scoped and allows you to declare a variable that can be reassigned later.

let variableName = value;

const: Also introduced in ES6, const is block-scoped and creates a read-only variable that cannot be reassigned.

const variableName = value;

Here's an example of creating a variable:

var message = "Hello, world!";
let count = 5;
const PI = 3.14;

In the example above, the variable message is created using var and assigned the value "Hello, world!". The variable count is created using let and assigned the value 5. The variable PI is created using const and assigned the value 3.14.