Debian 7.5 (codename wheezy) DVD 1/3

Debian is under continual development. The latest release is Debian 7.5. It is also (currently) known as stable or by its codename "wheezy".

Each version also corresponds to a set of named software repositories (at least one per CPU architecture).

At any given time, there is one stable release of Debian, which has the support of the Debian security team. When a new stable version is released, the security team will usually cover the previous version for a year or so, while they also cover the new/current version. Only stable is recommended for production use.

There are also two main development repositories unstable and testing which are continually updated during the development of the next stable release. The latest packages arrive in unstable (which always has the codename "sid"). Packages are automatically copied from unstable to testing when they meet criteria such as lack of release-critical bugs, and dependencies being satisfied by other packages in testing.