I have seen this question at many places about asking what the meaning of an official page is?
Especially on a search term when it was showing by default at Google, I hope this answer will help.
What is the meaning of official page?
A page with all feeds belongings to the company or to someone (Individual) submitted by them or from a group of people as a team or by own could be an official page.
It can be on its own hosted website or can be at any XYZ source over the internet, like we create pages on Facebook for business or persional, or on LinkedIn for business or persional purpose.