Define data types

Answer 1

data types are very useful to allocate the specified memory to the variables.it indicates which type of variable we are using
for example,
int x;
here we declared x as integer it consists only integers and compilers reserves 2 bytes memory to store it.

Answer 2

the data type defines the use of an identifier. Additionally, it shows what data is about to be stored and indicates what type of operations and manipulations the programmer can implement

Answer 3

data type is the type of programe means it tells about wich type of data we can use in it there is many data types e.g int is for integer values ,float is for those values which includes poimts (3.23)and many more like that every data typa is different from the other one