As of October 26, 2023, Apple TV+ has not announced a season 4 of Foundation. Check the official Apple TV+ website or reliable entertainment news sources for the most up-to-date information regarding renewals.

If and when Foundation season 3 is released, it will be available exclusively on Apple TV+. A subscription to Apple TV+ is required to watch the series.

In the context of the Apple TV+ series, 'Foundation' refers to the adaptation of Isaac Asimov's science fiction book series of the same name. It depicts a group dedicated to preserving human knowledge and civilization during a galactic empire's predicted collapse.

Whether Foundation is worth watching depends on individual preferences. It is a visually stunning, complex science fiction drama with a large scope, appealing to viewers interested in world-building, political intrigue, and philosophical themes.