Refinancing replaces your current mortgage with a new one. Here are the main reasons homeowners choose to do it:
Changes the interest rate, the loan term, or both, without advancing new money. The goal is usually to save money monthly or over the life of the loan.
You take out a new loan for more than you owe on your current mortgage. The difference is paid to you in cash. This typically has a slightly higher interest rate than a rate-and-term refi.