A paid traffic manager plans, sets up and monitors the ads that bring customers online. In practice, they decide which channel to advertise on, to whom, with what message and with how much daily budget. Then they read what came back and adjust. It is ongoing work, not a one-time setup.
Google Ads management
Serves people who are already searching for the service: keyword selection, negative keywords for searches that only spend, ads aligned with the offer and, when the purchase is local, Google Maps. Details on the Google Ads management page.
Meta Ads management (Facebook and Instagram)
Creates demand among people who weren't searching yet, with audience, offer and creative. Instagram is a placement of this platform, not a separate contract. See how it works in Facebook and Instagram Ads.
What comes with the media
Conversion tracking (to know which ad generated the message or sale), periodic reading of the numbers and a conversation about where the click lands. If the page doesn't convert, a landing page comes before raising the budget.