If an entity's content is found within the dtd, the entity is known as an internal entity.
Entities are used to define keyboard shortcuts for special characters. Entities are of two types - internally or externally. In other words, entities are used to define shortcuts for special characters in XML documents.
Internal Entity-
If an entity is declared in the DTD, it is called an internal entity. The syntax for internal entity declaration is
<!ENTITY entity-name "entity-value">
If an entity is declared outside the DTD, it is called an external entity. You can refer to an external entity using a system identifier or a public identifier.
The Syntax is-
<!ENTITY name SYSTEM "URI/URL">
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