Digital Marketing is the construct of advertising online. This means it includes many different types and styles of marketing services from organic growth services like search engine optimization and content marketing to paid advertising services like Google AdWords and everything in between.
Website design is the process of creating websites. It encompasses several different aspects, including web page layout, content production, and graphic design. While the terms web design and web development are often used interchangeably, web design is technically a subset of the broader category of web development.
Website Maintenance is the process to keep a website's software and plugins up to date and running smoothly. This allows the website's content team to focus on building content vs. ensuring that the website operates correctly.