Difference between Google CalDAV API and Google Calendar API

Question

I am a bit confused, is Google CalDAV API for managing domain wide calendars and events? Thus Google Calendar API is just for managing users calendar? Or are they same?

Answer 1

CalDAV API will become available for whitelisted developers, and will be shut down for other developers on September 16, 2013. Most developers’ use cases are handled well by Google Calendar API, which we recommend using instead. Official Google Blog

Apparently Google backtracked and reinstated CalDAV API since developers were depending on it.