Grammar:Tutorial/Preposition of direct object את
If a direct object for a verb is definite (either having a definite article or being a proper name) then before the object the preposition את is added. If the object is indefinite, there should be no את.
Also a noun with a pronoun suffix (see below) is definite (but without an article).
This preposition also may mean "with" (a synonym of the preposition עם).