Full Service means that the broker is responsible for providing the seller with all normal brokerage services, including: marketing, MLS input and maintenance, negotiations, etc.
Limited Service means that the broker will provide some services and not others. For example, the agent may list the property on the MLS and handle negotiations; however, marketing may be the responsibility of the owner.
Entry Only means the broker is only obligated to enter and maintain the listing on the MLS. All other aspects are the responsibility of the owner.