Getting pre-approved for a mortgage is essential when searching for a dream home, as it sets realistic expectations and allows for quicker offers. A pre-approval provides insight into what you can afford, locks in an interest rate for 60 to 130 days, and requires documentation like income proof and credit checks. While pre-qualification is a simpler process, pre-approval offers a more accurate borrowing amount. It's crucial to maintain your financial situation during this period, as changes can affect approval. Pre-approvals are typically valid for 90 to 120 days.