Exactly what it says on the tin. Games where you role-play a character through text.
Anyway, check out AI Dungeon — it’s been trained on shitloads of material, so genre and plot possibilities are endless. Plus you get to practice English. I personally have played there a bunch of fantasy plots, sci-fi, a Winx-inspired play, a bunch of political campaign plots, some plots where my character accidentally ended up participating in a trap orgy, and more. The only thing that limits you is your fantasy.