bpo stands for Business Process Outsourcing and it have two 
process inbound and outbound. In Inbound process the call 
were recied by the customer and in Outbound Porcess call 
were made.

BPO means Business Process Outsourcing. When a company is 
migrating or outsourcing some or all of its processes to 
another Country or Business Associate is actually called as 
BPO. Usally in India BPO is Misunderstood as Call centers. 
All the processes including Banking, Insurance, software 
and Medical transcription which we do for the line of 
business from an other country comes under BPO. The two 
types of BPOs are Domestic and MNC BPOs and two types of 
processes are Voice based and Non Voiced Processes.  A 
company does Outsourcing mainly for Cost reduction, Quality 
and to get 24*7 service, as u know most of the employees in 
developed countries rarely use to  work on holidays, 
nightshift and Over time.

bpo is a buisness process of outsoucing which is use to 
exchanging data across the world.