What is a logo with red circle and has a c inside the circle?

The logo you are describing is likely the logo of the popular video platform YouTube. It features a red play button enclosed within a white rectangle, but if you're referring specifically to a "C" inside a red circle, it might be the logo of a different brand, such as the social media platform "Cloob," which uses a red circle with a "C." For a precise identification, more context about the brand or its industry would be helpful.