Zend is used for developing PHP based applications for almost all industry verticals such as online retail shop, real estate, media, social media, publishing, and, etc. The primary purpose of Zend Framework is to make PHP, a powerful language and ease its adoption. It has seen two generations namely ZF 1 and 2 since its inception and has successfully built several enterprise grade PHP applications.

Source: https://zenddeveloper..in/2016/07/an-overview-of-official-release-of-zend.html