What functionality does the calls feature provide on Apple devices?

The calls feature on Apple devices allows users to start and receive phone calls across various devices linked through the same Apple ID. This functionality is particularly beneficial for users who are utilizing a Mac, iPhone, iPad, or Apple Watch, enabling them to make and receive calls seamlessly without needing to be tethered to their iPhone. Through the use of features like Continuity, calls can be routed to devices other than the iPhone, allowing for greater flexibility and convenience, especially in multi-device environments.

This integration is especially helpful in scenarios where users might not have their iPhone directly on hand but still want to maintain communication. It enhances user experience and productivity by allowing for calls to be answered on the device that is most convenient at the moment.