Deloitte is a privately owned consultancy firm headquartered in the UK. Founded in 1845, it offers professional advice and services in various fields. As of 2023, Deloitte employs over 429,080 people worldwide and is considered one of the "Big Four" accounting firms, along with PricewaterhouseCoopers, Ernst & Young, and KPMG. The company provides services in audit & assurance, consulting, financial advisory, risk advisory, tax & legal, and technology. Deloitte serves a wide range of clients, including businesses, governments, and individuals, across multiple industries.