Ajax isn’t a technology. It’s really several technologies, each flourishing in its own right, coming together in powerful new ways.
—Jesse J. Garrett, who coined the name AJAX
Some example use-cases for Ajax techniques are
• “Type ahead” input suggestion, as in Google search.
• Sending form data asynchronously.
• Seamless navigation of web-presented maps, as in Google Maps.
• Dynamically updated lists and tables, as in Gmail and other web-based email services.
• Web-based spreadsheets.
• Forms ...