PPC stands for Pay-Per-Click, which is an online advertising model where advertisers pay a fee each time their ad is clicked. It is a way to drive traffic to websites, where advertisers bid on specific keywords relevant to their target audience. When a user searches for those keywords, the ads appear at the top or bottom of search engine results pages. PPC campaigns can also be run on social media platforms and other websites, allowing advertisers to reach their target audience and only pay when someone clicks on their ad.