I have seen "NG+" in many games, but I don't know what it means, does anyone know? (Optional: Answers in Spanish)

"New Game Plus", which is typically an option to start a game with items/leveling/equipment that you gained in a completed playthrough. There may be other differences as well, such as the option to warp to the final boss right away in Chrono Trigger.

Thank you for answering :)