What are the role of the CAPFs ?

The MHA manages 7 central police forces : 

i. CRPF , which assists in Internal Security and Law & Order
ii. CISF , which protects vital installations ( like airports ) and PSUs
iii. NSG , Which is a special counter-terrorism force
iv. BSF 
v. ITBP }------- Border Management

vi. SSB

vii. AR