Photographic Memory: On the list of enhancements built into people, with the note that it is originally only eidetic short-term, and requires voluntary “fixing” to persist as long-term eidetic memory; it also includes the ability to suppress and erase them on demand.  (These to avoid being Cursed With Awesome.)  A normal education trains this ability to a very high level.

Also, where externally stored memories count, this is what lifelogs and remembrance agents do.