Hiya @Tauriel_Elderfeather! So, role plays are basically like stories (like your favorite fiction novel ) that we like to write. Some role plays are called "free" role plays, which is where it's like the Continuous Story game: One person writes a piece of a story, another finishes it. The other type is not free (I forget what it's called), which means that only one person can control the chapters being made, and it's more like a real, actual book - ish.
For making a role play, here's a guide by the marvelous @Xonos_Darkgrate1:
Hope this helps, and let me know if you need any other help!