The document discusses the present perfect tense in English. It explains that the present perfect expresses actions that occurred at an unspecified time before now and have relevance to the present. It is used to talk about experiences, events, or states that began in the past and continue in the present or have results that are visible now. Some key uses of the present perfect include actions that are ongoing or habitual up until now, actions that are recently completed with relevance to now, and actions that occurred multiple times before now.