Discovery Communications, Inc. operates as a media company worldwide. The company operates through U.S. Networks, International Networks, and Education and Other segments. It owns and operates various television networks under the Discovery Channel, TLC, Animal Planet, Investigation Discovery, Science Channel, Velocity, Discovery Family Channel, Destination America, American Heroes Channel, Discovery Life, The Oprah Winfrey Network, Eurosport, Discovery Kids, DMAX, and Discovery Home & Health brands, as well as other regional television networks. The company's content spans genres, including survival, exploration, sports, lifestyle, general entertainment, heroes, adventure, crime and investigation, health, and kids. It also develops and sells curriculum-based education products and services, such as an online suite of curriculum-based video on demand (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, the company operates production studios that develop content; and Websites. It provides content through various distribution platforms comprising pay-television, free-to-air and broadcast television, Websites, digital distribution arrangements, and content licensing agreements, as well as various platforms that include brand-aligned Websites, online streaming, mobile devices, VOD, and broadband channels. As of December 31, 2017, the company operated approximately 400 distribution feeds in 40 languages internationally. Discovery Communications, Inc. was founded in 1985 and is headquartered in Silver Spring, Maryland.