Roku is a brand and a series of digital media players, streaming devices, and smart TVs that allow users to access and stream online content on their televisions. Roku devices are designed to provide a user-friendly and convenient way to watch streaming services, such as Netflix, Hulu, Amazon Prime Video, Disney+, and many others, on a television screen.

1. Streaming Platform: Roku offers its own operating system and platform that provides access to a wide range of streaming channels and apps. It includes a Roku Channel Store where users can add or remove channels as per their preferences.
2. Hardware Variety: Roku offers a variety of hardware options, including standalone streaming devices, streaming sticks, and smart TVs with Roku built-in. These devices connect to your TV via HDMI and require an internet connection to function.
3. User Interface: Roku’s user interface is known for its simplicity and ease of use. It features a customizable home screen with tiles for installed channels and apps, making it easy for users to navigate and find the content they want.
4. Content Search: Roku provides a universal search feature that allows users to search for movies, TV shows, actors, and directors across multiple streaming platforms simultaneously. This makes it easier to find content without having to search within each individual app.
5. Mobile App: Roku offers a mobile app that can be used as a remote control for your Roku device, and it also allows you to stream content from your mobile device to your TV.
6. Screen Mirroring: Some Roku devices support screen mirroring, which enables you to mirror the screen of your smartphone, tablet, or computer on your TV.
7. Voice Control: Some newer Roku devices come with voice control capabilities, allowing you to search for content and control your device using voice commands.

Roku has become a popular choice for cord-cutters and individuals who want to access streaming content without the need for a traditional cable or satellite TV subscription. It competes with other streaming platforms and devices like Amazon Fire TV, Apple TV, and Google Chromecast. Users can choose the Roku device that best suits their needs and budget, and it continues to evolve with regular updates and new features.