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An Entity Relationship Model also known as an Entity Relationship Diagram a graphical representation of entities and their relationships to each other typically used in computing in regard to the organization of data within databases or information systems An entity is a piece of data an object or concept about which data is stored A relationship is how the data is shared between entities The three types of relationships between entities are one-to-one one-to-many and many-to-many One-to-one is when one instance of an entity A is associated with one other instance of another entity B One-to-many is when one instance of an entity A is associated with zero one or many instances of another entity B but for one instance of entity B there is only one instance of entity A Many-to-many is when one instance of an entity A is associated with one zero or many instances of another entity B and one instance of entity B is associated with one zero or many instances of entity A A Semantic Object Model is developed from objects that are already known This model is normally used to document a system program or object that is already in use and working properly Another term for Semantic Model from the field of knowledge representation is ontology the set of classes relationships and functions in a universe of discourse
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