Raspbian is a free operating system based on Debian GNU/Linux, which is optimized for Raspberry Pi hardware (armhf processor architecture). Raspbian comes with more than 35,000 software packages or pre-compiled software, which is packaged in a graceful format to facilitate installation on Raspberry Pi. The first creation of the release was completed in June 2012, but it gained a sustained and active development and focused on improving the stability and performance of as many Debian packages as possible. Although Debian provides a release for the arm architecture, it is only compatible with the Raspberry Pi later version (ie ARMv7-A central processor and later, compared to Raspberry Pi’s ARMv6 central processor)
Raspbian 2019-06-20 released.
“To support Raspberry Pi 4, we are shipping a radically overhauled operating system, based on the forthcoming Debian 10 Buster release. This brings numerous behind-the-scenes technical improvements, along with an extensively modernised user interface, and updated applications including the Chromium 74 web browser. “