Facebook Ads is an advertising platform created by Facebook that allows businesses to create and publish ads targeted at specific audiences on the social media platform. The concept of Facebook Ads revolves around creating targeted and engaging ads that reach the right audience at the right time, and encouraging them to take action.

The structure of Facebook Ads includes several key components:

1. Campaign: This is the highest level of structure in Facebook Ads, where you choose your objective and set a budget for your ad campaign.

2. Ad set: Within a campaign, you can create multiple ad sets, each with its own targeting, budget, and schedule.

3. Audience: You can target specific audiences for your ads based on a variety of factors, such as demographics, interests, behaviors, and more.

4. Placement: You can choose where your ads will be shown, such as in the Facebook News Feed, Instagram feed, or in other placements across the web.

5. Ad creative: This includes the visual and text components of your ad, such as images, videos, and ad copy.

6. Call-to-action (CTA): This is the action you want your audience to take after seeing your ad, such as visiting your website or making a purchase.

By carefully crafting each of these components, businesses can create effective Facebook Ads that reach their target audience and drive desired actions, ultimately leading to increased brand awareness, website traffic, and sales.