The word draft has several meanings:

1. An early version of something written, like an essay or story. Your first draft might have spelling mistakes and unclear sentences, which you fix in later drafts. Professional writers often go through five or ten drafts before their work is ready. When you draft a letter, you're writing that first version, knowing you'll improve it later.
2. A current of air moving through a space. You might feel a cold draft coming through a window crack in winter, or notice a draft when someone opens a door while you're sitting nearby. Buildings with poor insulation tend to be drafty, meaning cold air sneaks in through gaps.
3. The system once used to require citizens to serve in the military. During certain wars, the U.S. government held a draft where young men were chosen, sometimes by lottery, to join the armed forces. Being drafted meant you had to serve whether you wanted to or not. Today, the U.S. military is all-volunteer, but young men still must register for potential future drafts. Sports leagues also use drafts, where teams take turns choosing new players.
4. To follow closely behind something moving to reduce wind resistance. In cycling or car racing, you can draft behind another racer, saving energy while keeping pace.