What does the present perfect tense represent?

The present perfect tense represents an action that has been completed before the present time, emphasizing the connection between past actions and their relevance to the current moment. This tense is formed by using "have" or "has" followed by the past participle of the verb. For example, in the sentence "I have finished my homework," the action of finishing the homework occurred in the past, but it is relevant to the present situation. This usage highlights the importance of the completed action without specifying when it occurred, thus focusing on the effect or result that it has in the present.