What is a PhD? The real answer...
https://phd.academy/blog/what-is-a-phd
A PhD is the entry qualification to the world of professional academia. And the purpose of a PhD is to develop and then demonstrate the skills of a professional academic researcher. You may have no intention of becoming a professional academic researcher, but this is what the system is set up for.
0:00 Introduction- What is a PhD?
0:20 Common definitions
2:00 A PhD as the pinnacle of the education system
3:00 The differences between a PhD and other qualifications
4:45 My definition of a PhD