Big Tech in India, also known as the Indian IT Giants, are the largest companies in the Indian information technology industry. The definition primarily includes Tata Consultancy Services, Infosys, HCLTech, and Wipro, and also often encompasses Cognizant and Tech Mahindra. They are referred to in the media as "Big Six" or "Big Five",[1][2] and with acronyms such as TWITCH[3] and WITCH.[4][5] The companies are among the dominant players in the global delivery model, providing IT consulting, outsourcing and offshore software development to Fortune Global 500 corporations and government entities. All six companies feature among the 20 largest employers in India, while five of them are part of the NIFTY 50 benchmark index of most valuable publicly-listed companies.