A Beginner's Guide Java Tutorial (Operators and Precedence)

Simply put, variables are reserved memory locations where values can be stored. This indicates that you reserve memory space when you create a variable.
Based on a variable's data type, the operating system allocates memory and decides what can be stored there.

the reserved memory As a result, you can store integers, strings, and numbers by assigning variables to various data types.

You can use decimals or characters in these variables.