Difference between Var v/s Let v/s Const in Javascript

In JavaScript, we can define variables by three keywords var, let, and const. Please get the difference as below:

VAR:: A variable declared with var is accessible throughout the function or globally if declared outside a function.

LET:: A variable declared with let is only accessible within the block in which it is defined

CONST:: The variable cannot be re-assigned to a new value. However, their contents can be modified for objects and arrays.