How does BYDDF differ from BYDDY?

1. How does BYDDF differ from BYDDY?

I don’t understand this forum post – "BYDDY is a sponsored ADR. BYDDF is traded on Hong Kong Stock Exchange."

When I Googled this, I saw "ARKQ (ETF) is holding BYD/BYDDF. a decent size positon."

2. When "I viewed all holdings" on ARKQ, I see BYDDY listed as UNsponsored. What does "UNsponsored" and "sponsored" mean?