IF This Then That, also known as IFTTT (pronounced ) is a free web-based service to create chains of simple conditional statements, called applets.
An applet is triggered by changes that occur within other web services such as Gmail, Facebook, Instagram, or Pinterest.
For example, an applet may send an e-mail message if the user tweets using a hashtag, or copy a photo on Facebook to a user's archive if someone tags a user in a photo.
In addition to the web-based application, the service runs on iOS and Android. In February 2015, IFTTT renamed their original application to IF, and released a new suite of apps called Do which lets users create shortcut applications and actions. As of 2015, IFTTT users created about 20 million recipes each day. All of the functionalities of the Do suite of apps have since been integrated into a redesigned IFTTT app.
IFTTT is an initialism for If This Then That.