An ER diagram is a data modeling tool used to create visual diagrams representing different entities and their relationships. An ambulance-specific ER diagram can be used to document the various entities involved in the ambulance service, such as patients, doctors, paramedics, and ambulances, as well as their individual attributes and interconnections. This diagram can provide a detailed view of the system being modeled and can be used for analysis and optimization of the ambulance services. Use EdrawMax to download this template. From the built-in templates and style options, EdrawMax lets you customize such templates to the fullest.