Document Object Model (DOM)
Taken from w3schools.com – The W3C Document Object Model (DOM) is a platform and language-neutral interface that allows programs and scripts to dynamically access and update the content, structure, and style of a document.”
The W3C DOM standard is separated into 3 different parts:

Core DOM – standard model for all document types
XML DOM – standard model for XML documents
HTML DOM – standard model for HTML documents

The HTML DOM is a standard object model and programming interface for HTML. It defines:

The HTML elements as objects
The properties of all HTML elements
The methods to access all HTML elements
The events for all HTML elements

In other words: The HTML DOM is a standard for how to get, change, add, or delete HTML elements.
Viewed as a hierarchical tree – image is in the w3schools link attached above
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