One of the more recent additions to Pokemon GO is the tagging feature. Tagging simplifies and the task of tracking your Pokémon. Obviously that's a very quick-and-dirty explanation, but there's a lot more to it. If you know everything tagging offers, you can really make for a much smoother experience in Pokemon GO. For tips and tricks on how to use tagging, check out Pokemon Company's feature here.
Tag, you're it!