A Facebook ad campaign is a marketing strategy that involves creating and running ads on Facebook's platform to promote a product, service, or brand. The campaign is designed to reach a specific audience based on factors such as demographics, interests, behaviors, and location.

The process typically involves setting up a Facebook Ads account, selecting the objective of the campaign, choosing the target audience, creating ad creatives, setting a budget and bidding strategy, and launching the campaign. Ad creatives can include images, videos, carousels, or collections and can be placed in different ad formats such as feed ads, story ads, or messenger ads.

Facebook provides a range of ad targeting options and analytics tools that allow advertisers to monitor the performance of their campaign in real-time. These metrics can include impressions, clicks, reach, engagement, and conversion rates.

Facebook ad campaigns can be an effective way to reach a large audience and drive conversions, but success depends on careful planning and execution, as well as ongoing optimization and testing.