Explanation:

• Origins of CBI can be traced back to the Special Police Establishment (SPE) set up in 1941 in order to cases of bribery and corruption in War & Supply Department of India during World War II.
• The need of a Central Government agency to investigate cases of bribery and corruption was felt even after the end of World War II. So, DSPE (Delhi Special Police Establishment) Act, 1946 was brought that gave legal power of investigating cases to CBI.
• CBI is not a statutory body as it is not established by an Act of the Parliament.
• CBI investigates cases related to economic crimes, special crimes, cases of corruption and other high-profile cases.
• CBI comes under the jurisdiction of the Ministry of Personnel, Public Grievances and Pensions. Various organizations under this Ministry are Union Public Service Commission (UPSC), Staff Selection Commission (SSC), Lal Bahadur Shastri National Academy of Administration (LBSNAA), Central Vigilance Commission (CVC), CBI, Central Information Commission (CIC), etc.
• CBI is exempted from Right to Information (RTI) Act similar to National Investigating Agency (NIA), National Intelligence Grid (Natgrid), etc.
• CBI is headed by a Director, an IPS (Indian Police Service) officer of the rank of Director General of Police. The director is selected based on CVC Act, 2003 for two years-term. Several other ranks in CBI are filled through recruitment by SSC or deputation from Police, Income Tax Department and Customs Department.
• The appointment procedure of CBI Director has undergone several changes over time.