Answer Posted / ranganathkini

An Interfaces defines a public contract of methods for the
classes that implement it. An implementing class must
implement all the method defined by the interface.

An abstract class on the other hand not only defines a
public contract of methods but may also provide partial
implementation of some or all of the class methods. A
subclass of an abstract class inherits the partial
implementation (if any) or must provide a concrete
implementation of the abstract methods.

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