When asking about books, I suggest using shmoop.com because it gives short but descriptive chapter-by-chapter summaries.
Answer:
HyperText Markup Language
Hypertext Markup Language (HTML) is the standard markup language for documents designed to be displayed in a web browser. It can be assisted by technologies such as Cascading Style Sheets (CSS) and scripting languages such as JavaScript.
It can be used to develop or maintain your website
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What was the excerpt? Or at least the sentance it's in?
Answer:
the revelation of an identity or fact, especially one that is concealed or likely to arouse disapproval.
Explanation: