Cus­tomer rela­tion­ship is a busi­ness rela­tion­ship in which one busi­ness (the sell­er) pro­vides goods or ser­vices to anoth­er busi­ness (the buy­er). Cus­tomer rela­tion­ships may be trans­ac­tion­al (mean­ing they are based on the com­ple­tion of spe­cif­ic trans­ac­tions) or ongo­ing (mean­ing the buy­er con­tin­ues to pur­chase goods or ser­vices from the sell­er on a reg­u­lar basis).