A digital marketing portfolio is a collection of work that showcases an individual's or company's skills and experience in the field of digital marketing. It can include examples of past campaigns, metrics of their success, and any certifications or education related to the field. It can also include a list of services offered, case studies and testimonials, and contact information. The purpose of a digital marketing portfolio is to demonstrate to potential clients or employers that the individual or company has the necessary skills and experience to effectively market their products or services online.