This document discusses adjective clauses. It defines an adjective clause as a clause that describes or provides more information about a noun. It explains that adjective clauses begin with connectors like who, which, that, whom, or whose. The correct connector depends on whether the clause refers to a person or thing, and the role of the connector within the clause. The document also distinguishes between restrictive clauses, which are essential to the meaning and have no commas, and nonrestrictive clauses, which provide extra information and have commas.