The 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. The present perfect progressive expresses an action that recently stopped or is still going on. It puts emphasis on the duration or course of the action.

There are some possibilities of overlap, but the basic difference is: present perfect simple = up to this point, so far (perhaps now is the end of the action) present perfect progressive = up to this point, and expect to continue. The keyword is "progressive", remember.