Biological Drugs in the time of COVID - What are they?

In this show DrA will discuss first what a "biologic" drug or therapy is then relate it to current and future treatments for COVID. Where did the idea for biologics come from? How are they made? What are benefits they have? What risks do they have? Specifically for COVID what biologics are available currently and what do they do? And what does it mean when they say "Emergency Use Authorization" or "Phase-3 Trial" or "FDA Approved" - are these the same? Does it matter?