A map pack is the block of three local businesses, shown with a map and star ratings, that Google places near the top of results for searches with local intent, such as "dentist near me". The three come from Google Business Profiles, not websites, and they take most of the calls those searches produce.
Tap "More places" and the full map list appears, but few people do. The pack is also called the local pack or the local 3-pack, and it changes with where the searcher is standing, so you can be in it on one street and out of it three streets away.
