Horse racing odds represent the likelihood of a horse winning a race, expressed in a numerical format. These odds are determined by bookmakers and fluctuate based on factors like horse performance, jockey skill, and betting patterns. For example, odds of 5/1 mean that for every $1 wagered, a bettor would win $5 if the horse finishes first. Lower odds indicate a higher probability of winning, while higher odds suggest a long shot. Understanding these odds helps bettors make informed decisions and assess potential payouts before placing their bets.