What is the use for oop?

Answer 1

to make code shorther and help building large project comparing to procedural programming language (like pascal)

Answer 2

it simulates reality especially what can be seen. as an analogy, oop is street smart math. it can be fast, slick, and can take you to the final destination in most cases. functional programming is like the math from the ivory towers. it has deep academic foundations, it feels clunky to those fluent in street math, and it can solve many problems that are painful in street smart math.

put them together like in Scala, Java, C#, and the like, and you get the best of both worlds.