Advertising to demand that hasn't happened yet
Search ads work because someone is already looking. Meta advertising — ads across Facebook and Instagram — works on a completely different principle: it reaches people who aren't looking, in the middle of scrolling their feed, and puts your offer in front of them anyway.
This sounds harder, and in one sense it is — you have to earn attention rather than answer intent. But it opens up something search can't: demand generation. A new bakery, a seasonal promotion, a service most people don't know exists — these have little search volume, because nobody searches for what they don't know about. Meta lets you introduce yourself to the right people before they'd ever think to search.
The two channels are complementary, not competing. Meta plants the seed and builds awareness; Google Ads harvests the intent once it exists. A business running both catches customers at both stages of the journey.