A mortgage is a loan for buying real estate, using the home as collateral. It allows buyers to spread payments over years, typically 15-30, with monthly payments covering principal, interest, taxes, and insurance. Common types include fixed-rate, adjustable-rate, government-backed, jumbo, and balloon mortgages. The application involves preapproval, appraisal, underwriting, and closing. Careful budgeting, understanding terms, and saving for down payments are crucial for managing mortgage loans effectively.