Describe External Entity, Internal Entity and Parameter Entity in XML with suitable Example of each

In XML, entities are used to store data that can be referenced within the XML document. There are three types of entities in XML: external entities, internal entities, and parameter entities.

External Entity: An external entity is an entity that is defined in a separate file and referenced within the XML document. The entity declaration includes a URL or file path to the external entity.
Example:

<!DOCTYPE book [
  <!ENTITY copyright SYSTEM "copyright.txt">
]>
<book>
  <title>My Book</title>
  <author>John Doe</author>
  <copyright>&copyright;</copyright>
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