Difference between CPO and CAPF

What is the difference between  CPO and CAPF? 
Many candidates asked us this question which they faced in Delhi Police  and CAPF/CPO SI interview recently. Following are the examples of these organisations. Main difference is in their day to day work and responsibility.

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Central Police Organisation 

* Intelligence Bureau 
* Central Bureau of Investigation 
* Bureau of Police Research and Development. (BPRD) 
* National Crime Records Bureau 
* National Investigation Agency 
* Sardar Vallabhbhai Patel National Police Academy, Hyderabad. 
* North Eastern Police Academy, Shillong. 
* National Institute of Criminology and Forensic Science. (NICFS) 

Central Armed Police Forces 

* Assam Rifles (AR) 
* Border Security Force (BSF) 
* Central Industrial Security Force (CISF) 
* Central Reserve Police Force (CRPF) 
* Indo Tibetan Border Police (ITBP) 
* National Security Guard (NSG) 
* Sashastra Seema Bal (SSB)