Appendix C. Keeping The System Up-To-Date
Apt and yum both fill the same role: They install and update software packages. Both utilities compare the files in a repository (generally on the Internet) with those on the local system and update the files on the local system according to your instructions. Both utilities automatically install and update any additional files that a package is dependent on. Apt is slightly faster, especially over slow connections, and it supports a few more features, such as undoing upgrades. The yum utility is easier to configure and use than Apt. If you are familiar with Debian systems or find that yum lacks some features ...
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