Answer:
Whenever a class A uses another class or interface B, then A depends on B. A cannot carry out it's work without B, and A cannot be reused without also reusing B. In such a situation the class A is called the "dependant" and the class or interface B is called the "dependency". A dependant depends on its dependencies
when we use probably instead of definitely it means we're not completely sure of what we're saying. when we use definitely it means we're completely positive, 100% sure we're right.
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