When going into digital marketing, or even general marketing and advertising, you have quite a few options for where you could work. You could work on the digital marketing team for a larger corporation, or you could work for a digital marketing consulting firm, similar to an advertising agency. Sometimes companies rely solely on these firms for all their digital marketing, and other times a company might just use these companies to manage their Facebook page or update their Pinterest.
Which do you think you would prefer? Do you see yourself working with one company, creating strategies around their products/services, analyzing those strategies, and repeating that process? Or do you see yourself working on different projects, working with different companies, and having to be creative enough to understand many different companies and their customer bases?
Of course, each has their advantages and disadvantages. If you really want to go into digital marketing but you're not sure which side you would prefer, you should see your school's career advisor and try to set up an informational interview with someone from each side so you can get an even better picture of what working for a corporation and an agency is really like!