The Apple Watch is a smartwatch that is designed to be paired with an iPhone. It uses the iPhone's data connection to access the internet and other services, such as app downloads, messages, and notifications. This means that in order to use the Apple Watch, you need to have an iPhone that is compatible with the watch.
The iPad, on the other hand, is a tablet computer that does not have the same capabilities as an iPhone. It does not have a cellular connection, and it does not support the same range of apps and services as an iPhone. As a result, the Apple Watch cannot be paired with an iPad.
Additionally, the Apple Watch uses a proprietary communication protocol called the "W-series" chip, which is not supported by the iPad. This means that even if the iPad had the necessary capabilities to support the Apple Watch, it would not be able to communicate with the watch due to this technical limitation.
In short, the Apple Watch cannot be paired with an iPad because the iPad does not have the necessary capabilities and technology to support the watch. If you want to use the features of the Apple Watch, you will need to pair it with an iPhone that is compatible with the watch.