For storing values you have to declare a variable, for that the keyword var is used. There is no need to specify the data type.
Syntax:
var <variable name1> [,<variable name2> ,<variable name3> ,etc…]
Here square bracket indicates optional.
Eg: var x, y, z;
x= 11;
y = ”BVM”;
z = false;
Here x is of number type, y is of string and z is of Boolean type.