Identifying the right words to use in a search bar when conducting research can be difficult. Most of the time, a few different phrases need to be attempted before we can find the information we are looking for. In this case, some of the phrases you could start with are:
A formal tone helps establish the writer's respect for the audience and suggests that the writer is serious about his or her topic. It is the kind of tone that educated people use when communicating with other educated people.