A digital marketing agency reaches customers online through omnichannel marketing, multichannel marketing, or single-channel marketing. With multichannel and single-channel marketing, agencies interact with customers in one or multiple channels such as websites, blogs, email, social media, and more. A digital agency is a business you hire to outsource your digital marketing efforts, instead of handling in-house. They can provide your business with a variety of digital solutions to promote your product or service online and help you hit your marketing goals and grow your business. A digital agency is a business you hire to outsource your digital marketing efforts, instead of handling in-house. They can provide your business with a variety of digital solutions to promote your product or service online and help you hit your marketing goals and grow your business.