Co-mar­ket­ing is a part­ner­ship between two or more com­pa­nies in which they col­lab­o­rate on mar­ket­ing activ­i­ties in order to pro­mote their prod­ucts or ser­vices. This can include activ­i­ties such as co-brand­ed mar­ket­ing cam­paigns, joint pro­mo­tions, and shared social media or email mar­ket­ing efforts.