DoorDash is an on-demand restaurant delivery service. DoorDash was founded in 2013 by Stanford students Andy Fang, Stanley Tang and Tony Xu. A Y Combinator-backed company, DoorDash is one of several recently founded technology companies aiming to use logistics services to offer food delivery from restaurants on-demand. Its competitors include Tapingo, Postmates, GrubHub, Caviar (acquired by Square, Inc.), grocery delivery services like Instacart and other food startups. DoorDash launched in the South Bay of San Francisco in 2013 and has expanded to Los Angeles, Boston, Chicago, and most of the San Francisco Bay Area in addition to several other markets. DoorDash has raised nearly $60 million over several financing rounds from investors including SV Angel, Khosla Ventures, Sequoia Capital, and Kleiner Perkins Caufield & Byers. DoorDash was valued at $600 million in 2015 during a round of funding. On November 6, 2015, In-N-Out Burger filed a lawsuit against DoorDash claiming trademark infringement and unfair competition.