There are three various types of constructors , and they are as follows:.

- Default Constructor - With no parameters.

- Parametric Constructor - With Parameters. Create a new instance of a class and also passing arguments simultaneously.

- Copy Constructor - Which creates a new object as a copy of an existing object.

An instance of a user-defined type is called an object. We can instantiate many objects from one class.
An object is an instance of a class.

we can create more constructor inside the class

Overloading - is the concept of using one function or class in different ways by changing the signature of its parameters

A Base Class is a class that is inherited by another class. In .NET, a class may inherit from only one class.

more than one form. Ability to provide different implementation based on different number or type of parameters.

more than one thread run independent of each other within the process.

Interface is a Value type as well as Reference type

It is an object that can refer to a method.

It is not a class.
it is only definition of the methods without the body.