What is meant by data types??..what is their use??

Answer 1

Data Types; the value of what a variable is holding, or a value itself:

- Integers (regular numbers)
- Floats (decimals)
- Booleans (True/False Logical statements)

Things like that...

They are useful in every aspect of programming that has to do with logic and or numbers (which is basically all of it).

Answer 2

Just to add something...
Data types are backbone of any programming language.