[Internet] What is Ajax

What is Ajax? According to this well-written article, it's:

Ajax isn’t a technology. It’s really several technologies, each flourishing in its own right, coming together in powerful new ways. Ajax incorporates:

• standards-based presentation using XHTML and CSS;
• dynamic display and interaction using the Document Object Model;
• data interchange and manipulation using XML and XSLT;
• asynchronous data retrieval using XMLHttpRequest;
• and JavaScript binding everything together.

Phew... I had thought it's yet another standard with which I would have to start from zero. Kinda lazy you see...