Odds

A company or individual that accepts and pays out bets on sporting and other events. Bookmakers set the odds, manage risk, and build in a margin (overround) to ensure long-term profitability. Examples include Bet365, DraftKings, and FanDuel.

The amount of money a bettor risks on a single wager. Proper stake sizing is a critical component of bankroll management. Most professional bettors recommend risking between 1% and 5% of your total bankroll on any single bet to minimize the risk of ruin.

A virtual advantage or disadvantage applied to a team or player to level the playing field in a sporting event. For example, a -1.5 goal handicap means the team must win by 2 or more goals for the bet to win. Handicaps are used to create more balanced betting markets.

The final odds offered by a bookmaker just before an event starts. The closing line is widely considered the most efficient line because it reflects all available information and market activity. Consistently beating the closing line is a strong indicator of long-term profitability.

A single bet that combines multiple selections into one wager. All selections must win for the bet to pay out. The odds multiply together, creating potentially large returns from small stakes, but the risk increases with each added selection.

A professional or highly skilled bettor who consistently finds value in the betting markets. Sharps are respected by bookmakers and their action often moves lines. Being a sharp bettor implies disciplined bankroll management, statistical modeling, and a long-term positive expected value approach.