Why do we use data types in programming?

Question

Data types

Answer 1

i = 10;

Variable "i" dosent know how much memory it should allocate to store 10...

That's why we need to specify what datatype the variable will store.

So variable "i" needs to be of datatype integer to allocate the correct amount of memory to store a number.

Answer 2

Why we use names for different types of species ??