NBA postseason series

generate a one-sentence description for a given conceptual class.
# Response Format
Return only the sentence: "Description: [one-sentence description of the conceptional class]"

Class: NBA postseason series

An NBA postseason series is a multi-game playoff matchup between two teams, typically in a best-of-seven format, where the first team to win the required number of games advances to the next round or wins the championship.