dpkg is the software at the base of the Debian package management system. dpkg is used to install, remove, and provide information about .deb packages.
dpkg itself is a low level tool; higher level tools, such as APT, are used to fetch packages from remote locations or deal with complex package relations. End users are encouraged to use tools like aptitude or synaptic, having a more sophisticated way of dealing with package relationships and a friendlier interface.
The Debian package "dpkg" provides the dpkg program, as well as several others necessary for run-time functioning of the packaging system, including dpkg-statoverride, dpkg-divert and update-alternatives. It also includes the programs such as start-stop-daemon and install-info, and the latter is kept mostly due to backwards compatibility (it is developed and distributed separately nowadays). The Debian package "dpkg-dev" includes the numerous build tools described below.
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