The direct answer
The creator economy refers to the broader set of ways individual creators, rather than traditional media companies, earn income directly from an audience they built themselves. Sponsorships, selling a product or course, platform-paid programs, and direct subscriptions from fans all fall under it.
What changed to make it possible
The shift is that a single person can now build, reach, and monetize an audience without a traditional media company, publisher, or studio as an intermediary. Distribution used to require an institution. It is now available directly through the platforms themselves.
It is rarely one single income source
Most creators earning a real, sustained income combine several of the available paths rather than relying on one: sponsorships plus a product, or platform payouts plus a subscription tier. Any single source can shift quickly on its own, which is why the mix tends to hold up better.