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| Question | Answer |
| What is an entity type? | Represents a physical or abstract concept with some sort of identity and some descriptive features. |
| What is an attribute? | The descriptive features of entities are called attributes. |
| What is an entity? | Corresponds to a set of entities having the same set of attributes. |
| What is a relationship type? | Represents a connection between two or more entity types. |
| What is a key? | An attribute that has unique values for every instance of an entity type. |
| What is a weak entity type? | Those that are meaningless without an owner entity type. |
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