Answer
$\{c,d\}$
Work Step by Step
Recall the following: $x\in A\cap B$ if and only if $x\in A$ and $x\in B$. Thus, to find the intersection of the given sets, we must find all elements that appear in both sets. This gives us: $$\{a,c,d,e\}\cap\{c,d,f,h\}=\{c,d\}$$
