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Nvidia (NASDAQ: NVDA) ( /?n?v?di?/ in-vid-ee??) is an American global technology company based in Santa Clara, California. Nvidia is best known for its graphics processing units (GPUs). Nvidia and chief rival AMD Graphics Technologies (formerly ATI Technologies) have dominated the high performance GPU market, pushing other manufacturers to smaller, niche roles. Nvidia's best known GPU product line labeled "GeForce" is in direct competition with AMD's "Radeon" products.
In addition to GPU manufacturing, Nvidia provides parallel processing capabilities to researchers and scientists that allow them to efficiently run high-performance applications. They are deployed in supercomputing sites around the world. More recently, Nvidia has moved into the mobile computing market, where it produces Tegra processors powered phones and tablets, as well as auto infotainment systems. In addition to AMD, its other competitors include Intel and Qualcomm.

http://en.wikipedia.org/wiki/Nvidia