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Abstract classes look a lot like interfaces, but they have something more: You can define a behavior for them. There are only the signatures of the methods, which implies that the methods do not have a body. It's great when it matters, such as in embedded devices. They are more expensive to use, because there is a look-up to do when you inherit from them.
The advantage is that it provides a way for a class to be a part of two classes: one from inheritance hierarchy and one from the interface.As usual with programming, there is theory, practice, and practice in another language :-) An Interface contains only the definition / signature of functionality, and if we have some common functionality as well as common signatures, then we need to use an abstract class.By using an abstract class, we can provide behavior as well as functionality both in the same time.In simple words, it is a kind of contract that forces all the subclasses to carry on the same hierarchies or standards. An interface has no implementation; it only has the signature or in other words, just the definition of the methods without the body.As one of the similarities to Abstract class, it is a contract that is used to define hierarchies for all subclasses or it defines specific set of methods and their arguments.I will point out main differences, and the rest have already been explained: Abstract classes are useful for modeling a class hierarchy.At first glance of any requirement, we are partially clear on what exactly is to be built, but we know what to build.The purpose of an abstract class is to provide a base class definition for how a set of derived classes will work and then allow the programmers to fill the implementation in the derived classes. You can think of an interface as a class which is only allowed to have abstract methods and nothing else.So an interface can only "declare" and not define the behavior you want the class to have.In Python, abstract classes are more a programming trick you can get from the ABC module and is actually using metaclasses, and therefore classes.And interfaces are more related to duck typing in this language and it's a mix between conventions and special methods that call descriptors (the __method__ methods).