According to YouTube, which held a press conference at its headquarters, Sponsored Videos lets users promote their videos by bidding on keywords. Here's how it works: First, YouTube users, whether individuals or corporations, decide which of the videos they've uploaded they want to promote through site search. Then they decide which keywords they want to target.
Google, YouTube's parent company, has created automated tools that help users place bids for the keywords in an automated online auction, as well as set spending budgets. When people use keywords in search terms for videos, YouTube will display relevant videos alongside the search results. If you're, say, a Hollywood film studio, maybe you bid on the words "movie trailer."YouTube Video Advertising