Int type takes up 2 bytes or 4 bytes. In a 32-bit system, the int type occupies 4 bytes, while in a 16-bit system, the int type occupies 2 bytes, and in a 64-bit system, the int type occupies 8 bytes. In java, the int type occupies 4 bytes, while in python, the int type has no byte limit and can be adjusted automatically. Int is a data type keyword used to declare variables of integer type. In a programming language, an integer is a number without a decimal part, which can be positive, negative or zero. To declare a variable of integer type, you need to use the keyword int followed by the variable name.