A package manager is a tool that monitors the software installed on your computer, facilitating the installation of new applications, upgrading existing software to more recent versions, or removing previously installed programs. As the name indicates, a package manager manages packages, which are groups of files packaged together for installation and removal as a single entity. Logically, a Debian package manager executes this function on the Debian interface.
It offers a user interface that aids individuals in overseeing the assortment of packages installed on their system. In summary, this procedure is referred to as Package Management. Furthermore, Debian package files generally carry the .deb extension.