Pre-approval is a strategic step in the home buying process because:
The interest rate is guaranteed up to 60 days, even if interest rates go up. And if a better promotion comes up in the meantime, you're still eligible to apply for it. It's a win-win for you.
You know the mortgage amount that you can borrow to purchase your home, so your real estate agent can show you homes that are within your price range.
Sellers are more interested in offers from buyers who have their financing already lined up.