Advertising revenue is generated when people watch ads that are running on videos. This revenue from ads is shared between YouTube and the Creator - thus empowering Creators to directly profit from their work.
Companies pay money to Google for showing ads to you.
No. They get money for clicks.
No.
https://www.youtube.com/intl/en_us/howyoutubeworks/product-features/monetization
Companies pay money to Google for showing ads to you.