Ajax can be used to create single-page apps , in which the entire web app consists of a single document, which uses Ajax to update its content as needed.

Initially Ajax was implemented using the XMLHttpRequest interface, but the fetch() API is more suitable for modern web applications: it is more powerful, more flexible, and integrates better with fundamental web app technologies such as service workers . Modern web frameworks also provide abstractions for Ajax.

This technique is so common in modern web development that the specific term "Ajax" is rarely used.