What is object? And how to initialize an object?

Answer 1

An object is an instance of a class.

For example, if this was your class..
class Apple
{
// your code here

// default constructor is used
// unless you write your own
};

This is how you'd make an object of it:
Apple variable_name = new Apple();

You now have an object of Apple, called variable_name.

Answer 2

An object basically has attributes and methods.

An object is created from a class using a constructor.

For example I may have a class called Vehicle which might have the attributes make, manufacturer and horsepower.

To create an object from the Vehicle class i would do something similar to Vehicle car1 = new Vehicle();