explain which situation we use interface in projects

Interfaces are better suited to situations in which your applications require many possibly unrelated object types to provide certain functionality.

Interfaces are more flexible than base classes because you can define a single implementation that can implement multiple interfaces.

Interfaces are better in situations in which you do not need to inherit implementation from a base class.

Interfaces are useful in cases where you cannot use class inheritance. For example, structures cannot inherit from classes, but they can implement interfaces.

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