Empty Set Proof [duplicate]

Prove that the empty set is a subset of every set.

I don't really know where to start other than the fact that I know a symbolic representation of the empty set and that it is included in every set.

The definition of $A\subseteq B$ is that, for every element $x\in A$, it follows that $x\in B$ as well. Since the empty set has no elements, this is true vacuously.