A digital marketing certification should help you get a job, depending of course on your other professional experience, your educational background, and the soft skills you bring to the table.
To an employer, a digital marketing certification will validate that you are trained on the most current possible digital marketing strategy, tools, methodologies, and best practices. Your certification will also indicate that you have experience in all the various forms of marketing that would likely be required by a marketing job, including content marketing, email marketing, search media advertising, social media marketing, successful video marketing strategy, and more.
If you have no professional experience, a digital marketing certification should be enough on its own to get you a digital marketing internship or entry-level job. Learning the fundamentals of digital marketing can also be valuable in related fields such as design, product, or web development, so a digital marketing certification could potentially help get you a job even if marketing is not your primary professional focus.