What is integer

Deepak Kerav , you have posted here a real bunch of very basic questions. have you tried to use google before posting here?

Yes, integer is any number doesn't have point when u write it and may be positive or nigative

In some languages You also have an unsigned int type, which means that value held doesn't have either + nor - sign and is always read as a positive number.

Integer is a datatype. It's get almost 4 bytes of memory size

Yes, integers are numbers that don't have decimal points whether positive or negative

An integer is a number which has no decimals, and it can be positive or negative. Positive:- numbers after zero. Ex: 1,2,3.... Negative:- numbers before zero. Ex: -1,-2,-3.......

Yes, and they have a limit to how big the number can be before you reach integer overflow for both positive and negative values. If you want decimal points you need a float or double.