Below the top-tier of the competition, you will find teams from all over the world that are fighting to get into the Qualifiers so they can put together a title bid.
Twenty-six teams play in each of World Group I and World Group II at the start of the year, with nations drawn against each other based on their ranking.
Ties are played on a home-or-away basis, meaning one nation hosts the other, and the matches take place over the course of two days. Ties are decided in a best-of-five matches format, meaning the first team to win three matches, wins the tie.
On day one, teams name two players to compete in singles matches. These players are known as No. 1 and No. 2 singles players. The No. 1 on each team plays the No. 2 on the opposing team on day one.
On day two, there are up to three matches contested. The second day's play starts with a doubles match, followed by a singles match between the No. 1 singles players and then, if needed, the tie will be decided by the singles match between the No. 2 singles players.
Any match played before one team has won three points is known as a "live match". If the result of the tie is already decided, teams sometimes play matches that are known as "dead matches".
The World Group I and II Play-offs take place in the first Davis Cup week of the year. Teams in the World Group I Play-offs are competing to advance to World Group I in September. From there they can move up to the Qualifiers.
Teams that lose in the World Group I Play-offs find themselves in World Group II in September, where they play against one of the winning teams from the World Group II Play-offs.
Teams that lose in the World Group II Play-offs compete in their respective Group III regional event.