An interlude was typically a short dramatic piece, often comic in nature, placed between more serious material. It began during the Middle Ages as a form of lighthearted stuffing (hence interlude) between miracle and morality plays. These were typically short satires or farces. There is even evidence of interludes being used as propaganda in times of religious conflict. There is also proof of interludes functioning as morality plays, themselves. The form matured into witty performances enacted at Court during the Tudor period, entertaining both royalty and courtiers, alike. John Heywood’s The Four P’s (c.1543) is a typical example of an interlude. – Justin Cash
Excellent analysis of the interlude in Medieval drama.
Short, but useful explanation of this form during the Medieval and Elizabethan periods.
Very good historical account of the origins and growth of the interlude (slides 25 and 26).
Concise definition of the interlude from Oxford Reference.