Tizen is an open-source operating system that was developed primarily for use in mobile devices such as smartphones, tablets, wearables, and smart TVs. It is based on the Linux kernel and is designed to be lightweight, secure, and flexible. Tizen also supports web-based technologies such as HTML5, CSS, and JavaScript, making it easy to develop apps for the platform. It is mainly used by Samsung for its smartwatch and smart TV devices. Tizen development requires specialized skills like experience in Linux-based operating systems and web-based programming languages.