Ubuntu is a free and open-source operating system that can be used on desktops, servers, and devices. It offers benefits like saving money, protecting data, extending hardware lifespan, providing free apps, and integrating social apps. Ubuntu has a user-friendly interface, easy installation, media and hardware compatibility. It has a large community that provides support through documentation, chat, forums, mailing lists and AskUbuntu. There are different desktop environments to choose from and options to customize the interface. Ubuntu can also be used for servers, academia, and making custom distributions.