A Custom Software Maintenance and Support Agreement is a legally binding contract between two or more parties wherein one party provides maintenance and support services for customized software. This type of agreement typically specifies the type of software being maintained, the frequency of maintenance and support services, the fees applicable, and any warranties provided by the service provider. It is important to understand that this type of agreement should be tailored to the specific needs of each customer to ensure the best return on investment in custom software. It is also important to note that these agreements usually cover routine maintenance and upgrades, bug fixes, and technical assistance when needed.