Doing Business As or DBA is also known as a fictitious business name in some states. Most commonly used by individuals presenting themselves as a business. Think of “George” operating a mobile car wash – with the business name “Sparkle Clean Wash”. This helps with marketing and helps his clients identify him and his service.
Once you set up a company (LLC or Corporation), the company name replaces the need for a DBA. “Sparkle Clean Wash, LLC” is the business name and George is now separate from the company.
If George also had a business recycling old electronics and he wanted to use the Sparkle Clean Wash, LLC, he could register a DBA for Sparkle Clean Wash, LLC doing business as Green Planet Recycling and the LLC would have a DBA, not George.