What is the HTML Document Object Model? What is its significance for clientside scripting? What is the relationship between JavaScript and Java? What is an applet? Why applets are usually not...

What is the HTML Document Object Model? What is its significance for clientside scripting? What is the relationship between JavaScript and Java? What is an applet? Why applets are usually not considered an example of scripting? What is HTML? XML? XSLT? How are they related to one another?