what is Deloitte and for what it is working?

 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, unites kingdom.Deloitte provides audit, consulting, financial, advisory, risk advisory, tax and legal services with approximately 312,000 professionals globally. In FY 2019, the network earned a record US$46.2 billion in aggregate revenues. As of 2019, Deloitte is the 4th-largest privately owned company in the United States. The firm has sponsored a number of activities and events including the 2012 summer Olympic.