Deloitte Touche Tohmatsu Limited, commonly referred to as Deloitte, is a multinational professional services network. Deloitte is one of the "Big Four" accounting organizations and the largest professional services network in the world by revenue and number of professionals with headquarters in London, United Kingdom. 

Deloitte provides audit, tax, consulting, enterprise risk and financial advisory services with approximately 312,000 professionals globally. In FY 2019, the network earned a record US$46.2 billion in aggregate revenues. As of 2017, Deloitte is the 4th largest privately owned company in the United States. 

Deloitte member firms offer services in the following functions, with country-specific variations on their legal implementation (i.e., all operating within a single company or through separate legal entities operating as subsidiaries of an umbrella legal entity for the country).

Audit provides the organization's traditional accounting and audit services, as well as internal auditing, IT control assurance and Media & Advertising Assurance.

Consulting assists clients by providing services in the areas of enterprise applications, technology integration, strategy & operations, human capital, and short-term outsourcing.

Financial advisory provides corporate finance services to clients, including dispute, personal and commercial bankruptcy, forensics, e-discovery, document review, advisory, mergers & acquisitions, capital projects consulting and valuation services.

Risk advisory provides offerings in enterprise risk management, information security and privacy, data quality and integrity, strategic & reputation risk, regulatory risk, project risk and cyber risk, and business continuity management and sustainability.

Tax & legal helps clients increase their net asset value, undertake the transfer pricing and international tax activities of multinational companies, minimize their tax liabilities, implement tax computer systems, and provides advisory of tax implications of various business decisions.

GovLab is the internal think tank of Deloitte Consulting LLP's Federal Government consulting practice, focused on innovation and government reform.

According to en.wikipedia

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