What does data type mean?

Question

I want to understand about data type.

Answer 1

int a=5
datatype is integer or number
string c="hello"
datatype is string
The word seems self explanatory,the type-of-the-data

Answer 2

it talks about the type of data ,explains about the type of value hold by the variable.

Answer 3

data type tells about which type of data it is..nd it is main for c nd cpp prgms..data type meant by int,float,char,double etc
nd also data type means it is a pre defined data type..which explain before