Formal and informal language are two ways that you can talk to people, informal is like casual talk. Formal is kind of like serious talk.
Informal language is personal, like when you are talking to friends, family, or people who are close with. Informal language is like slang. Saying things like “hi” instead of “hello”.
Formal language is when you are adressing someone you don;t know well, like strangers or important people. Formal language is like showing respect. Formal language can not use slang. For example, “hello” is formal, but “hi” is not.
Formal and informal are 2 ways to talk to people. Informal is personal, and formal is when addressing people who you don’t know well.