what is a varialbel in js code example

Example 1: variables in js

var Hello = "World";
let bool = false;
const int = 8788;

Example 2: variable in js

////We can define variables in 3 ways {var,let,const}/////// 
////syntax- var variable_name=value;
/////  let variable_name=value;
/////const variable_name=value;

var myfristvariable="neha jaiswal";
const mysecondvariable=80;
let mythirdvar=abc;