This document defines and describes several common types of bank accounts and financial instruments. It explains that savings accounts allow customers to earn interest on set aside funds while providing liquidity for banks to issue loans. Checking accounts allow withdrawals and deposits to access very liquid funds via various payment methods. Mortgages are loans secured by real estate collateral that buyers use to finance large property purchases without paying the full amount upfront. Certificates of deposit are low-risk, interest-bearing investments that offer higher returns than comparable options in exchange for keeping funds in the account for a set maturity period.