Facebook Portal allows companies to advertise directly on Facebook to attract users to their websites. It works similarly to pay-per-click ads, where companies pay Facebook a fee each time a user clicks their ad. By advertising on Facebook, companies can reach the over 1 billion Facebook users and divert them to the company website with just a click, making it an effective way to drive traffic without needing users to search externally. Facebook Portal gives businesses a way to leverage Facebook's massive user base for promotional purposes.