A pronoun is when you refer to someone so many times that you just start using she, her, they, xe, and many more. three common pronouns are she, him, them, her, he, they, you get the point.
like instead of saying 'Jessica' over and over, you could just use 'Jessica's' pronouns, which could be whatever 'Jessica' wants them to be.
NOW
PEOPLE CAN
STOP SAYING THAT PRONOUNS ARE NEW, PRONOUNS EXISTED ALREADY. a pronoun is a simple sufix that humans use commonly everyday when referring to someone or something to sum this whole
definition up.
also if you don't know someone's pronouns it would be polite to just use they, them, theirs, their.
person #1> "Who is that?"
person #2> "I don't know their name
yet, but I heard they
play soccer!"
see? person #2 used a non-
binary (theythem) pronoun instead of using their name which person #2 doesnt know.