Defining Relative Clause is usually introduced by a relative pronoun, such as WHO, WHICH, THAT, WHOSE, etc. A defining relative clause comes immediately after a noun and needs a main clause to make a complete sense. These clauses follow a noun and make clear who or what we are talking about. We don’t put commas at the end of the clause. Remember that a defining clause has no commas.
People who drink and drive are danger to everyone.