A conventional mortgage loan is one that’s not guaranteed or insured by the federal government. Most conventional mortgage loans, aka conventional mortgages, are "conforming," which simply means that they meet the requirements to be sold to Fannie Mae or Freddie Mac. Fannie Mae and Freddie Mac are government-sponsored enterprises that purchase mortgages from lenders and sell them to investors. This frees up lenders’ funds so they can get more qualified buyers into homes.

Conventional mortgages can also be non-conforming, which means that they don’t meet Fannie Mae’s or Freddie Mac’s guidelines. One type of non-conforming conventional mortgage is a jumbo loan, which is a mortgage that exceeds conforming loan limits.

Because there are several different sets of guidelines that fall under the umbrella of "conventional loans," there’s no single set of requirements for borrowers. However, in general, conventional loans have stricter credit requirements than government-backed loans like FHA loans. In most cases, you’ll need a credit score of at least 620 and a debt-to-income ratio of 50% or less.

Government-backed loans are insured by federal agencies. This insurance protects the lender if the borrower fails to repay the loan and is meant to encourage lenders to offer mortgages to a wider range of home buyers.

Conventional mortgages are offered by many lenders that also offer government-backed loans. Lenders generally view conventional loans as riskier because they’re not guaranteed by the government, so conventional mortgages tend to have tougher requirements.

Mortgages backed by government agencies offer different qualifications that can make them more attractive to some home buyers.