Finding Pokemon
When Pokemon GO was first released in the Summer of 2016, the original method for tracking Pokemon was the Pawprint System. Within the Pawprint System, a player could see just how far a Pokemon was from them by the number of Pawprints near the Pokemon's Icon found in the Nearby Pokemon Tab. The more pawprints by the Pokemon, the further it was from the player trying to track it down. The player could then try to track the Pokemon by clicking on it and isolating their search on that single Pokemon, changing directions based on how many pawprints disappeared or appeared.
However, this system was flawed in more ways than one, and many skilled trainers took advantage of these flaws by developing software that showed what Pokemon were in a given player's area and how long the spawn of that Pokemon had left. (The most famous website for said method of advanced tracking was Pokevision.) And because of these people technically hacking the Pokemon GO Tracking System, Niantic took away the Pawprint System and all forms of tracking whatsoever, as well as threatening to sue said websites tapping into the Pokemon GO Tracking.
After months of no tracking being available to players - one of the main reasons why so many players quit playing the hit mobile game - niantic finally developed and released the newest and latest form of tracking, the pokestop Tracking System. With this new tracking, players can see exactly what Pokemon are in the radar of nearby pokestops, as well as a number of Pokemon in the wild with no exact location (often found between PokeStops). Many players still feel this newest form of tracking can still be improved - many are still hoping for a system that shows every Pokemon in their given area and the exact location of said spawns - but most are still appreciative that there is at least some form of tracking after a period of nothingness.