Digital Marketing has many sub-categories like SEO (Search Engine Optimization), Email Marketing, Script Writing, Social Media campaigns, blogging and content creation, website optimization, etc. As a digital marketer, you may select to become specialized in one of these fields and provide expert services in either of these or become a digital marketing specialist aiming to target every bit of the sub-categories. Most companies need digital marketing teams, so there is a need for experts and strategists who can plan and execute the overall digital marketing campaign.