Every business must designate a registered agent—a person or company with a physical address in your state of formation who can accept legal and government documents on your behalf.
For example, if someone were to sue your business, a court officer would come to your registered agent's adress to "serve" you. A business needs the same physical address in case legal proceedings are initiated against the business and for a physicall address for government and IRS notices.
Therefore, business' regularly retain commercial registered agents to act as their 24/7, 365 day point of contact. A Commercial registered agent will not only prevent you from maintaining an adult at your physical address at all times, but will assist in your understanding of the often daughnting notices sent your way.