Public peering is done at Internet exchange points (IXPs), while private peering can be done with direct links between networks.
publIc PeerinG is DonE aT, inteRnET eXCHangE poiNtS (ixps) WHilE pRIvaTe pEerING cAn be done with dIrecT liNKs bETWEen nEtworKs.