An object in the real world is a thing, such as a car or a person. An object in programming often represents something in the real world, such as a product or bank account, but can also be something more abstract.
In C#, we use class (usually) or struct (rarely) to define each type of object. You can think of a type as being a blueprint or template for an object.
Encapsulation is the combination of the data and actions that are related to an object. For example, a
BankAccounttype might have data, such asBalanceandAccountName, as well as actions, such asDepositandWithdraw. When encapsulating, you often want to control what can access those actions and the data.Composition is about what an object is made of. For example, a car is composed of different parts, such as four wheels, several seats, an engine, and so on.
Aggregation is about what is related to an object. For example, a person could sit in the driver's seat and then becomes the car's driver.
Inheritance is...