Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things.
It is one of the most popular desktop Linux operating systems.

Ubuntu is developed by Canonical and a community of other developers, under a meritocratic governance model.Canonical provides security updates and support for each Ubuntu release, starting from the release date and until the release reaches its designated end-of-life (EOL) date. Canonical generates revenue through the sale of premium services related to Ubuntu.

The term Ubuntu derives from South Africa

Ubuntu is named after the Nguni philosophy of ubuntu, and roughly translates to "humanity toward others. with a connotation of "I am what I am because of who we all are".
The name is a nod to the Ubuntu project's commitment to the principles of open-source software development.

For desktop computers, two versions of Ubuntu are available

The regular Ubuntu release provides up-to-date software and a recently developed Linux kernel, which means you get better hardware support. Not only that, but you also get the latest versions of the applications you use every day. Because the regular release refreshes quickly, you'll have the newest version of your favourite programs.
The LTS version of Ubuntu is better for people who don't like to upgrade an operating system regularly. On LTS systems, everything stays the same as long as possible. The system receives updates for security and bug fixes only. You can download older LTS versions from the alternative downloads page if that's your preference.

Ubuntu aims to be secure by default

Most network ports are closed by default to prevent hacking. A built-in firewall allows end-users who install network servers to control access.
Ubuntu also supports full disk encryption[60] as well as encryption of the home and Private directories.