The number of teams usually varies between 20 and 22, with nine riders in each. The entry is by invitation to teams chosen by the race organiser, the Amaury Sport Organisation . Team members help each other and are followed by managers and mechanics in cars.
The rider with the lowest aggregate time at the end of each day wears the leader's yellow jersery on the next day of racing. The course changes every year, but the race has always finished in Paris. Since 1975, the final stage has been along the Champs-Élysées.
If you want to see it you are in time. Le tour de France starts from June 30th to Sunday July 22th.