An advert (also called a spot or commercial) is a single advertisement audio file that you want to play on air. Each advert belongs to an advert campaign and contains details like the audio file/track, duration, and scheduling rules for when it should play during the day or week.

An advert block is a sequence of multiple adverts that play together back-to-back during a specific time slot, typically scheduled at fixed points throughout the hour such as at the top of the hour or during natural breaks. When you add an advert block to your playout log or clock, PlayIt Live automatically fills it with individual adverts from your advert log based on your campaign scheduling rules. The advert block has settings like maximum duration and maximum number of adverts to control how many spots play in that break. This feature requires the Advanced Scheduling module.