Qualification - Since the second World Cup in 1934, qualifying tournaments have been held to thin the field for the final tournament. They are held within the six FIFA continental zones (Africa, Asia, North and Central America and Caribbean, South America, Oceania, Europe), overseen by their respective confederations. For each tournament, FIFA decides the number of places awarded to each of the continental zones beforehand, generally based on the relative strength of the confederations' teams, but also subject to lobbying from the confederations.
Soccer World Cup

The qualification process can start as early as almost three years before the final tournament and last over a two-year period. The formats of the qualification tournaments differ between confederations. Usually, one or two places are awarded to winners of intercontinental play-offs. For example, the winner of the Oceanian zone and the fifth-placed team from the Asian zone will enter a play-off for a spot in the 2010 World Cup. From the 1938 World Cup onwards, host nations have received an automatic berth in the finals. This right was also granted to the defending champions between 1938 and 2002, but was withdrawn from the 2006 FIFA World Cup onward, requiring the champions to qualify. Brazil, winners in 2002, thus became the first defending champions to play in a qualifying match.

Final tournament - The current finals tournament features 32 national teams competing over a month in the host nation(s). There are two stages: a group stage followed by a knockout stage.

In the group stage, teams compete within eight groups of four teams each. Eight teams are seeded (including the hosts, with the other teams selected using a formula based on both the FIFA World Rankings and performances in recent World Cups) and drawn to separate groups. The other teams are assigned to different "pots", usually based on geographical criteria, and teams in each pot are drawn at random to the eight groups. Since 1998, constraints have been applied to the draw to ensure that no group contains more than two European teams or more than one team from any other confederation.

Each group plays a round-robin tournament, guaranteeing that every team will play at least three matches. The last round of matches of each group is scheduled at the same time to preserve fairness among the teams. The top two teams from each group advance to the knockout stage. Points are used to rank the teams within a group. Since 1994, three points have been awarded for a win, one for a draw and none for a loss (prior to this, winners received two points rather than three). If two or more teams end up with the same number of points, tiebreakers are used: first is goal difference, then total goals scored, then head-to-head results, and finally drawing of lots (i.e. determining team positions at random).

The knockout stage is a single-elimination tournament in which teams play each other in one-off matches, with extra time and penalty shootouts used to decide the winner if necessary. It begins with the "round of 16" (or the second round) in which the winner of each group plays against the runner-up of another group. This is followed by the quarter-finals, the semi-finals, the third-place match (contested by the losing semi-finalists), and the final.

The World Cup was first televised in 1954 and is now the most widely-viewed and followed sporting event in the world, exceeding even the Olympic Games. The cumulative audience of the 2006 World Cup — including all of the matches — is estimated to be 26.29 billion. 715.1 million individuals watched the final match of this tournament (a ninth of the entire population of the planet). The 2006 World Cup draw, which decided the distribution of teams into groups, was watched by 300 million viewers.

Six of the seven champions have won one of their titles while playing in their own homeland, the exception being Brazil, who lost the deciding match (known as Maracanazo) when they hosted the 1950 tournament.

England (1966) and France (1998) won their only titles while playing as host nations. Uruguay (1930), Italy (1934) and Argentina (1978) won their first titles as host nations but have gone on to win again, while Germany (1974) won their second cup title on home soil.

Other nations have also been successful when hosting the tournament. Sweden (runners-up in 1958), Chile (third place in 1962), Korea Republic (fourth place in 2002), Mexico (quarterfinals in 1970 and 1986) and Japan (second round in 2002) all have their best results when serving as hosts. All host nations have progressed beyond the first round.

To date, the final of the World Cup has only been contested by European and South American teams. The two continents have won nine titles apiece. Only two teams from outside these two continents have ever reached the semi-finals of the competition: USA (North, Central America and Caribbean) in 1930 and Korea Republic (Asia) in 2002. The best result of an African team is reaching the quarter-finals: Cameroon in 1990 and Senegal in 2002. Oceania has only been represented in the World Cup three times, and an Oceanian team has reached the second round on only one occasion, when Australia progressed beyond the group stage in 2006.

All World Cups won by European teams have taken place in Europe. The only non-European team to win in Europe is Brazil in 1958. Only twice had consecutive World Cups been won by teams from the same continent — when Italy and Brazil successfully defended their titles in 1938 and 1962 respectively.