We can say that pointer is a variable which is used to stores address of other variable.The TECHNIC pointer is used is so simple pointer only stores the first byte of address and then we can FIND upcoming BYTES according to the size of the variable.To understand this we TAKE is example:-
For example if a variable of integer type is being accessed by a pointer. So the pointer will only store the first byte of the address and as integer datatype takes two bytes memory the next byte of address location can be find out by adding 1 to the first byte of the address.