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- A class can only inherit from one abstract class, but can implement multiple interfaces.

- An interface cannot have member variables.

Also, an abstract class can have a constructor (and instance initializers, and initialization expressions for its fields), which an interface can't. That means an abstract class can do work when it is created.

Although it's probably a good idea not to do too much work - a factory method would be better for that.

Did you read the article? Try again, search for "Why abstract classes can't be instantiated using a lambda".

Interfaces with the addition of default methods, in contrast to abstract classes, provide the inheritance of behaviour (but not state) from multiple sources.

multiple inheritance?