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MacTeX-2018 installs the complete TeX Live 2018 distribution. TeX Live runs on all modern operating systems, including Mac OS X, Windows, GNU/Linux, and various forms of BSD Unix. The distribution is the same on all of these systems; nothing has been added, subtracted, or modified to make it work on OS X. The decision to install the complete distribution rather than a useful subset is the result of advice from users new to TeX, who explained that when everything is installed, examples from books about TeX all just work.
MacTeX-2018 consists of several packages; a custom install option allows users to select which packages to install. The packages are