As managing your finances is even more important at the moment, it should be a necessity that you understand your APRs, but many people don't, which is a tad worrying.
The APR is the annual percentage rate and is the more common figure to hear about when it comes to loan applications. But then there is also the headline rate which can often put customers into a bit of a confused state.
The APR basically includes the basic interest rates on a loan, credit card etc as well as the basic charges which may be implemented. With headline rates, you need to have a read into the charges as well - often, even though they look like more attractive rates, they aren't.
Just make sure you know your interest rates before you sign on the dotted line. Understand them and you're a step closer to managing your finances successfully.