What is the definition for objects and oop?

Answer 1

OOP is a style of programming that stresses :
- encapsulation (with data hiding)
- inheritance
- polymorphism

In C++ this is implemented using classes (although you can use structs as well).

An object, OTOH, is an instance of a class in a program.

OOP is more a philosophy while an object is a physical entity in your program.

Answer 2

OOP (Object Oriented Programming) is a set of some programming principles. Search it on YouTube, you'll get all the answers with some nice illustrations.