What is Class? And when we use that?

Answer 1

OOP is a programming concept where you divide tasks into object methods.
Atleast it increases readability of code.
Objects are naturally the core part of OOP.

Class is a structure that can create objects. Class defines what its objects are and how they should work.

Example:
class Builder:
...

big_builder = Builder()
big_builder.build_house()

This line:
big_builder.build_house()
already tells that object big_builder builds a house. build_house is a method, a function, that could have a 1000 lines of code, but still this 1 line already tells much what the method would do. It is all described in 1 line of code that "big builder simply builds a house".

Example2:
class Plant:
...

tree = Plant()

while tree.is_alive():
if tree.needs_water():
tree.water()

else:
tree.grow()

This tells, that as long the tree is alive it will either get watered or it will grow.

The while loop would be put whole in method tree.live()

Answer 2

https://www.sololearn.com/learn/JUMP_LINK__&&__Python__&&__JUMP_LINK/2467/