What Is a Sack in Football?
A sack is when a defender tackles the quarterback behind the line of scrimmage before he can throw. Here is how sacks work, and how they are counted.
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What Is DRS in F1? (Drag Reduction System)
DRS (Drag Reduction System) opened an F1 car's rear wing to cut drag and help overtaking within one second of the car ahead. Here is how it worked.
What Is a Double Dribble in Basketball?
A double dribble is a ball-handling violation that gives the ball to the other team. Here is exactly when it is called, and the two ways it happens.
Cricket Fielding Positions Explained
Cricket fielding positions are named by angle and distance from the batter: slip, gully, point, cover, mid-on, fine leg and more. Here is the full map.
What Is a Penalty Kick in Soccer?
A penalty kick in soccer is a direct free shot from 12 yards (11 m) with only the goalkeeper to beat. Here is exactly how Law 14 works.
What Is a Safety in Football?
A safety in football is worth 2 points for the defense, scored when the ball-carrier is downed in his own end zone. Here is exactly how it happens.
What Is Esports? A Beginner's Guide
Esports is organized, competitive video gaming played by pro players and teams in leagues and tournaments. Here is how it works and the main game genres.
What Is a Submission in MMA?
A submission ends an MMA fight when a fighter is forced to give up, usually by tapping out, to escape a choke or joint lock. Here is how submissions work.
What Is a Grand Slam in Tennis?
The Grand Slam is tennis's four biggest tournaments: the Australian Open, French Open, Wimbledon and US Open. Learn what winning all four means.
What Is a Derby in Soccer?
A derby in soccer is a match between local or historic rivals. Learn what makes a game a derby, the types of rivalry, and why derbies mean so much.
How Do the NFL Playoffs Work?
The NFL playoffs are a single-elimination tournament of 14 teams that ends at the Super Bowl. Here is how seeding, byes, and the bracket work.
Match Play vs Stroke Play: What's the Difference?
Match play is scored hole by hole; stroke play counts total strokes across the round. Here is how the two golf formats differ and when each is used.