The UEFA Champions League decides which team is crowned the Champion of Europe. The tournament consists of 32 teams, but 78 or 79 teams compete for those 32 spots. Some teams will automatically qualify for those 32 spots due to finishing at the top of a premier European league or based on successful champions league performances in the past. The rest of the 32 spots are given to teams who perform well in a qualifying tournament. There is also a UEFA coefficient, which determines how many teams from each European country get spots in the round of 32. This coefficient gives countries who have achieved greater success on the national stage, and in previous Champions League competitions more bids for the round of 32, which is why you will often see 3-5 teams from powerful soccer countries such as Spain, England, Germany, Italy, and France.
UEFA (Union of European Football Associations) is an organization consisting of 55 European nations. This organization runs European football competitions such as the Champions League and Europa League. A tournament that pits the best club teams from across Europe against each other. There is a group stage, followed by knockout stage and final. The Champions League Final is one of the most watched sporting events in the World.
The teams that make up the 32 team fields are split up into 8 groups of 4, which are determined by a random draw. The teams play round robin style within their groups. Teams receive 3 points for every win, 1 point for every draw, and no points for every loss. The 2 teams with the most points advance to the final 16. If two teams have the same amount of points the away goal rule is always used in the Champions league. This means that the team with the most goals scored in away games in higher in the standings. In the round of 16, teams that finished first in their groups will face a team that finished second in a group other than their own. Once the round of 16 in complete there is a random draw to decide the bracket for the remaining 8 teams.
The round of 16, quarterfinals, and the semi finals are all played in a two legged manner, meaning that each matchup will consist of the two opponents playing each other twice. There is a game at each team's home field. The winner of the two game series is determined by goal aggregate. The final game which determines the European champion is a single match. If the game is tied at the end of regulation than there are two 15 minute periods of extra time. If the game is still tied at the end of extra time, then there is a Penalty Shootout to determine the winner.