The point spread is a betting line expressed as the number of points by which a favourite is expected to win, used to balance wagers on both teams.
The point spread is a number with a job: to make a lopsided game evenly attractive to bettors. Oddsmakers set the favoured team at minus the spread, meaning it must win by more than that margin for a bet on it to pay, while the underdog covers the spread by losing narrowly or winning outright. This entry defines the term only, as vocabulary. This site publishes no odds, lines, or wagering advice, and no quiz question will ever ask you to use one.
The concept predates its current ubiquity by generations. Point spreads spread through American sports in the mid twentieth century, and for most of the league's history official basketball covered the subject at a careful distance, even while fans used spreads informally as a shared shorthand for how good a team was supposed to be that night: a ten point favourite was simply a strong team in numbers.
That shorthand role is why the term appears in a fan glossary at all. Broadcasts, record discussions, and historical accounts reference spreads when describing expectations around famous games, and a reader needs the definition to follow the sentence. It stays here on those strict terms: definitional, neutral, and disconnected from any content about placing a bet.
In use"Listed as six point favourites, they won by four, which decided the point spread either way."