Refinancing is often used to lower your interest rate. If rates have dropped since you last financed your home, you may want to consider refinancing. Other common reasons to refinance include paying off a balloon payment, converting an adjustable rate loan to a fixed rate loan or to extract cash equity in your home (aka "cash out"). A couple reasons for cashing out would be to do some home improvements or to consolidate debt.
I would love to answer any questions you may have to see if refinancing your current loan would be beneficial for you!