Consultancy services provide expert advice in various fields such as business management, accounting, law, engineering, and more. Some common types of consultancy services include marketing/strategy consulting, HR consulting, IT consulting, real estate consulting, and more. Tata Consultancy Services (TCS) is a major Indian IT service provider and consultancy firm that employs over 120,000 professionals worldwide. TCS provides various enterprise solutions and services to clients across industries using a global delivery model.