Demand Lead Gen and PPC (Pay-Per-Click) advertising are closely related as PPC is often a key component of Demand Lead Gen strategies. PPC is a digital advertising model where advertisers pay a fee each time their ad is clicked. In the context of Demand Lead Gen, PPC campaigns are used to drive traffic to landing pages or websites where visitors can take desired actions, such as filling out a contact form, downloading a resource, or making a purchase.