What is the difference between Xpath and DOM (Document Object Model)?

This is the question asked in most of the interviews of Selenium:

DOM: 

The Document Object Model (DOM) is a cross-platform and language-independent convention for representing and interacting with objects in HTML, XHTML and XML documents. Objects in the DOM tree may be addressed and manipulated by using methods on the objects.

Ex: var element=document.getElementById("intro");

XPATH: 

XPath, the XML Path Language, is a query language for selecting nodes from an XML document. In addition, XPath may be used to compute values (e.g., strings, numbers, or Boolean values) from the content of an XML document.

Ex: //input[@id=”xxx”]

Selenium Webdriver Commands

This is the key of Selenium Webdriver Commands. These are the most commands which will help you in writing your scripts. 

Selenium Webdriver Commands