Tecmint:
Early this week (June 17, 2017), the Debian project announced the availability of the new stable version (Debian 9) codenamed Stretch.
With this release, the well-known and widely-used Debian 8 Jessie gained old-stable status, which designates the previous stable repository. As it always happens with the release of a new stable version, Stretch includes hundreds of new packages, and updates to thousands of others.