Based on information obtained from one or more of your connected Facebook Business Tools, this is the number of view content events ascribed to your advertising (ads). This metric tracks view content events that are ascribed to your advertising and tracked by one of your Facebook Business Tools (such as a Facebook pixel, Conversions API, app SDK, or offline event set). Depending on the attribution setting chosen, events may be counted differently. In some situations, statistical modeling can be used to account for events that cannot be counted directly due to incomplete or missing data.