Discovery Communications, Inc. operates as a media company worldwide. It operates through U.S. Networks; International Networks; and Education and Other segments. The company owns and operates various television networks under the Discovery Channel, TLC, Animal Planet, Investigation Discovery, Science, Velocity, Discovery Family, American Heroes, Destination America, Discovery Life, Oprah Winfrey Network, Eurosport, DMAX, and Discovery Kids brands. Its content spans genres, including survival, exploration, sports, lifestyle, general entertainment, heroes, adventure, crime and investigation, health, and kids. The company also develops and sells curriculum-based education products and services comprising online suite of curriculum-based VOD tools, professional development services, and digital textbooks, as well as student assessments; and publishes hard copy curriculum-based content for K-12 schools. In addition, it operates production studios that develop content for television service providers, as well as Websites. The company provides content through various distribution platforms, including pay-TV, free-to-air and broadcast television, digital distribution arrangements, and content licensing agreements, as well as various platforms, such as brand-aligned Websites, Web-native networks, on-line streaming, mobile devices, video on demand (VOD), and broadband channels. As of December 31, 2015, it operated approximately 380 distribution feeds in 40 languages internationally. The company is headquartered in Silver Spring, Maryland.