what is inbound ?

An in bound call center is one that exclusively or predominately handles inbound calls initiated by the customers rather then out bound calls .
                                                                      or

a call center agents or representative takes calls coming into the contact center

what is BPO ?

Business Process Out sourcing means running high quality,efficient,front office or back office work for companies,thereby executing transactions for end-customers,either over the telephone or internet .it includes voice & data process