Answer Posted / matt s

An interface definition specifies the 'intent' of a public
interface without forcing a base implementation. It's more
used (in favour of base or abstract classes) in cases where
the interface defines some common 'high level'
characteristics or concepts for completely different
implementations - e.g:

A 'dog' interface may be specified with common methods such
as 'scratch' and 'bark', but each type of dog's
implementation of those would be completely different.
It's still a useful design feature however as it recognises
there are similarities at the higher 'behaviour' level.

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