These conjunctions introduce dependent (subordinate) clauses and change the word order by moving the conjugated verb to the end of the subordinate clause.
Common examples: weil (because), dass (that), wenn (if/when), ob (whether), bevor (before), nachdem (after).
Examples
Ich gehe nach Hause, weil ich müde bin.
I am going home because I am tired.
Er sagte, dass er das Buch gelesen hat.
He said that he read the book.