Present perfect simple expresses an action that is still going on or that stopped recently, but has an influence on the present. It puts emphasis on the result.
Past Simple is used to express the idea that an action started and finished at a specific time in the past. Sometimes, the speaker may not actually mention the specific time, but they do have one specific time in mind
Present perfect is used to indicate a link between the present and the past. The time of the action is before now but not specified, and we are often more interested in the result than in the action itself.
