The Ad level is where the actual creative — images, videos, ad copy, and call-to-action buttons — lives. This lesson covers how each ad set can contain multiple ads, allowing you to test different creatives (like two different images or headlines) against the same audience to see which performs better. It also covers best practices for organizing your account structure, such as clear naming conventions for campaigns, ad sets, and ads, which becomes essential as your account grows and you need to track performance across many active campaigns.