CharacterData is a small but significant portion of JavaScript and Ajax based application. This function is used with DOM wherein it provides additional information for DOM for proper interpretation. CharacterData is used with actual text or connected after the text is written. As a key to DOM’s interaction with the text, CharacterData treats a single line of data as a node. A node would usually look this way: Sample Test Placed Here This will be defined by CharacterData by the number of characters and the actual text found