Relative clauses in Swedish grammar are used to provide further information about a noun in a sentence. These clauses generally start with a relative pronoun, such as “som” or “vilken/vilket/vilka,” and provide additional details about the subject or object in the main clause. Similar to English relative clauses, Swedish relative clauses can be restrictive or non-restrictive, meaning they can be essential to understanding the meaning of the sentence or add supplemental details that can be omitted without altering the meaning.