The present perfect is a tense used to talk about actions that have a connection to the present. It's formed with "have" or "has" plus the past participle of the main verb (e.g., "I have seen"). We use it to talk about past actions that are still relevant now or to talk about experiences in our lives. For example, "I have visited Paris" means at some point before now, I went to Paris. It's important for connecting past actions with the present.