what is this cup about?
A cricket tournament where a number of teams from all over the world play qualification rounds leading up to the finals
Cricket World Cup
The Cricket World Cup (officially known as ICC Men's Cricket World Cup) is the international championship of One Day International (ODI) cricket. The event is organised by the sport's governing body, the International Cricket Council (ICC), every four years, with preliminary qualification rounds leading up to a finals tournament. The tournament is one of the world's most viewed sporting events and is considered the "flagship event of the international cricket calendar" by the ICC.

which country has won the cricket world cup maximum number of times Australia
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Cricket World Cup [SEP] Introduction
The first three World Cups were held in England. From the 1987 tournament onwards, hosting has been shared between countries under an unofficial rotation system, with fourteen ICC members having hosted at least one match in the tournament. The current format involves a qualification phase, which takes place over the preceding three years, to determine which teams qualify for the tournament phase. In the tournament phase, 10 teams, including the automatically qualifying host nation, compete for the title at venues within the host nation over about a month. A total of twenty teams have competed in the eleven editions of the tournament, with ten teams competing in the recent 2019 tournament.