Difference between abstract class and non abstract class in C#

An abstract class is fast. The interface is absolutely abstract and cannot be instantiated . An abstract class cannot be instantiated. The interface cannot have fields.

The fourth difference between abstract class and interface in Java is that abstract classes are slightly faster than the interface because the interface involves a search before calling any overridden method in Java.10 Haz 2021

The short answer: An abstract class allows you to create functionality that subclasses can implement or override. An interface only allows you to define functionality, not implement it . And whereas a class can extend only one abstract class, it can take advantage of multiple interfaces.