Final answer:
Donna's action of fast-forwarding through commercials is termed 'zipping'. This behavior allows viewers to avoid watching commercials and save time.
Step-by-step explanation:
When Donna records shows and fast-forwards through the commercials when watching them later, she engages in behavior known as zipping. Zipping is the action of fast-forwarding through television commercials on a prerecorded program. It is a common practice for viewers who prefer not to watch the interruptions caused by commercials and want to save time while watching their favorite programs.