Serco Group is a British multinational outsourcing company that provides a range of public services across various sectors including defense, transport, health, justice, and immigration. They generate revenue by securing government and private sector contracts to manage and deliver essential services. Founded in 1929 as RCA Services Limited, Serco has evolved significantly, expanding its global footprint and diversifying its service offerings. Notably, the company has faced scrutiny and legal challenges over the years, but it remains a key player in the outsourcing industry.