Present perfect is a tense used to describe an action that started in the past, but the precise moment is not important, and that action continues or has a relation with the present.
Sentences in presents perfect hace the following structure:
Subject pronoun + Auxiliary Verb (Have/Has) + Verb in past participle such as in the sentence He has collected that particular coin for several years. It shows that the man started to collect that coin in the past, we do not know exactly and the action continues in the present.
