Many people think Andromeda is a new algorithm that decides who wins. It is not.

• Definition: Andromeda is Meta’s new Ad Retrieval Engine.
• The Analogy: Think of Andromeda as a security man at the gate of a crowded stadium. There are millions of ads trying to get in. Andromeda doesn’t pick the winner; he simply decides which ads are “fit” enough to even enter the stadium and compete.

The Goal: Andromeda’s job is Scale and Speed. It helps Meta find the right ads to consider out of billions of possibilities in milliseconds.