That depends on what kind of vinegar you are asking about. Pure
vinegar is a compound composed of Vinegar is acetic acid (HC2H3O2)
but the vinegar you buy in a store is a homogeneous mixture of
acetic acid and water.
It is usually a solution, which is basically another word for a
homogeneous mixture. It depends on the type of vinegar. White is
homogeneous, other vinegar is heterogeneous.