A group of pronoun sets, meaning that the person would like to be addressed as 'he/him' , 'they/them' , or 'it/its'.
Examples:
He went to the store yesterday
I met them in school today, they were really excited
It has a cat named Lila
He/They/It is/are really nice
you can also mix the pronouns in the sentences, for example:
It was talking with me about their dog, barney the other day. He really loves its pet