TeX Live is intended to be a straightforward way to get up and running with the TeX document production system. It provides a comprehensive TeX system with binaries for most flavors of Unix, including GNU/Linux and macOS, and also Windows. It includes all the major TeX-related programs, macro packages, and fonts that are free software, including support for many languages around the world. Many Unix/GNU/Linux operating systems provide TeX Live via their own distributions and package managers.
Some starting points for actually using TeX are in this introduction to the TeX world.
By the way, if you prefer an alternative to TeX Live, the other major (free software) TeX distribution is MiKTeX, which also runs on GNU/Linux, macOS, and Windows.
Plan for TeX Live 2024:
10feb: candidate/final sources committed, test builds begin.
17feb: tlpretest starts, CTAN updates continue there and in tlnet.
2mar: code freeze for final build, major bug fixes only.
10mar: final updates from CTAN, final doc tweaks.
13mar: release TL and MacTeX.
As of this year (2024), the TeX Collection DVD will no longer be sent as a TUG membership benefit. The images will be available for individual download and burning.
TeX Live has been developed since 1996 by collaboration between the TeX user groups. TeX Live was originally perpetrated by Sebastian Rahtz. Present miscreants include Akira Kakuto, Hironobu Yamashita, Hironori Kitagawa, Karl Berry, Luigi Scarso, Mojca Miklavec, Norbert Preining, Reinhard Kotucha, Siep Kroonenberg, Takuji Tanaka, and a cast of thousands.