A DMP is actually the simple predecessor of the CDP. A DMP is a Data Management Platform which is intended for orchestrating campaigns based on external data such as Facebook, Instagram, Linkedin etc. But cookies from websites are also data that can be used for this purpose. But because cookies are no longer accepted as a legal method, it is a solution that will be phased out and replaced or supplemented by a Customer Data Platform in which mainly 1st party data is stored.