Formal, Informal.
Formal, formal is mostly used when talking speaking to people you never met, or don’t know, For example is you want to get a job and have to send a email, you should use formal laguage.
Informal, informal lagauge is used when talking to people you are really close with, or people you have known for a long time.
Then done a task where I had an informal text then made into an formal text.