Roku OS is the proprietary operating system developed by Roku Inc. It's designed specifically for Roku's line of digital streaming devices and smart TVs. Roku OS is a key component of the Roku platform, enabling users to access and enjoy a wide variety of digital content on their television screens. Here are some key features and aspects of Roku OS:

1. User-Friendly Interface: Roku OS is known for its simple and intuitive user interface. It features a grid-style layout with customizable rows of streaming channels (apps) and content recommendations, making it easy for users to navigate and find their favorite content.

2. Channel Store: Roku OS includes the Roku Channel Store, where users can browse and add streaming channels to their Roku device. The store offers thousands of channels, including popular streaming services, niche content providers, and even casual games.

3. Search and Discovery: Roku OS provides universal search functionality, allowing users to search for movies, TV shows, actors, directors, and more across multiple streaming channels. This simplifies content discovery by displaying search results from various sources.

4. Voice Control: Many Roku devices come with voice control capabilities through the Roku Voice Remote or the Roku mobile app. Users can search for content, control playback, and launch channels using voice commands.

5. Screen Mirroring and Casting: Roku OS supports screen mirroring and casting from compatible devices like smartphones, tablets, and laptops. This feature enables users to display content from their mobile devices on their TV screens.

6. Regular Software Updates: Roku devices receive periodic software updates that improve performance, enhance security, and introduce new features. Users are encouraged to keep their devices up to date for an optimal streaming experience.

7. Private Listening: Some Roku devices support private listening through the Roku mobile app. This feature allows users to listen to audio from their TV through headphones connected to their mobile device.

8. Cross-Platform Authentication: Roku offers a single sign-on feature, allowing users to authenticate and access certain streaming services using their Roku account credentials. This streamlines the login process for multiple apps.

9. Roku Channel: The Roku OS includes the Roku Channel, which is Roku's own free streaming service. It offers a curated selection of movies, TV shows, live news, and more. While it includes advertisements, it doesn't require a subscription.

10. Developer-Friendly: Roku OS provides a platform for developers to create and publish streaming channels and apps for Roku devices. This has led to a diverse selection of content options available to Roku users.

Roku OS is designed to provide a seamless and enjoyable streaming experience for users of Roku devices and Roku-powered smart TVs. Its user-centric design and regular updates contribute to its popularity in the digital streaming market.