Variables
variables are used to store values, they act as containers
x = 5;value 5 is stored in x
var x = 5;x is declared as variable, and value of 5 is assigned to it. x can be redeclared in the same block
const x = 5;x is declared a constant, and the value once assigned, cannot be changed
let x = 5;x is assigned a value of 5, and the x cannot be redeclared in the same block-scope
a = 4;
b = 2;
c = a + b;variables can be used in expressions like a + b. Values of a, and b are substituted in place of them