Locations, loot and enemies are among the things that can be marked with Apex's ping system. It can also be used to communicate with your teammates, eliminating the need for a microphone.
Although a success among critics, Apex Legends' predecessors, Titanfall and Titanfall 2, didn't live up to EA's sales expectations. The new kid in town appears to be changing this, however, and has become a huge success for the relatively new team of developers behind it.