YouTube now display videos from partners at the top of the search results and in the right sidebar. For some reason, YouTube likes to call these videos "featured videos". According to the help center, "featured videos will be primarily populated with videos from YouTube's thousands of partners, but might also include select user videos that are currently popular or that we have previously showcased in Spotlight Videos. (...) Featured videos are not advertisements or paid placements, but do feature content from partners with whom we have a commercial relationship."
Source:→ Google OS