A written agreement is a legally binding contract between two or more parties that outlines the terms and conditions under which they agree to perform certain actions, share resources, or exchange goods and services. It provides a clear and detailed record of what has been agreed upon by all parties involved and serves as evidence in case any disputes arise later on. A written agreement can take many forms such as a contract, memorandum of understanding, lease, loan agreement, or partnership agreement, among others. The key is that it must be put into writing to ensure its enforceability in court if necessary.