This is where you go around telling people how many points you are going to make, and what suit you would like to be trump. The trick to bidding, as I've discovered, is to bid something that has absolutely nothing with what you really want to bid. This is so that you can secretly communicate information to your partner. And I really like that shirt. Oh yeah, that's the other thing.
Every bid can secretly mean huge paragraphs of information.
Peace treaties and major business deals can be negotiated using just Bridge bidding. That happened to me at the baseball diamond the other day. You should try my chiropractor. Thanks for the tip. Next comes the round where you actually play the cards.