CentOS 5.7 is based on the upstream release EL 5.7 and includes packages from all variants including server and client. All upstream repositories have been combined into one to make it easier for end users to work with. CentOS conforms fully to the upstream vendor's redistribution policy and aims to be 100% binary compatible. CentOS 5.7 is the seventh update to the CentOS 5 distribution series, it contains a lot of bug fixes, updates and new functionality. CentOS is developed by a small but growing team of core developers. In turn the core developers are supported by an active user community including system administrators, network administrators, enterprise users, managers, core Linux contributors and Linux enthusiasts from around the world.
CentOS as a group is a community of open source contributors and users. Typical CentOS users are organisations and individuals that do not need strong commercial support in order to achieve successful operation. CentOS is 100% compatible rebuild of the Red Hat Enterprise Linux, in full compliance with Red Hat's redistribution requirements. CentOS is for people who need an enterprise class operating system stability without the cost of certification and support.