C3.ai is a software company that provides a platform for developing and deploying enterprise-scale AI applications. The company was founded in 2009 by Tom Siebel and is headquartered in Redwood City, California. C3.ai's platform is used by a range of industries, including oil and gas, manufacturing, and healthcare. The company has raised over $500 million in funding and was valued at $3.3 billion as of 2020.