Americans use "elevator", British use "lift" for the same thing - a type of vertical transportation that carries people or goods between floors of a building
Refers to the level and style of spoken and written discourse depending on the context you are in. It determines the vocabulary, tone, and structure of your language
Used in a professional context. It is highly structured, impersonal, and more serious in its tone, vocabulary, and grammar. It is common in the workplace, academe, business, trade and other industries
Casual, personal, and more intimate in its tone, sentence structure, and choice of words. This is appropriate when communicating with people you know very well such as your family, relatives and friends