# What is the difference between only if and iff?

I have read this question. I am now stuck with the difference between “if and only if” and “only if“. Please help me out.

Thanks

$A \text{ only if } B$ is the logic statement $A \Rightarrow B$.
$A \text{ iff } B$ is the statement $(A \Rightarrow B) \land (B \Rightarrow A)$