International cricket
Most games are played as parts of "tours", when one nation travels to another for a number of weeks or months, and plays a number of matches of various sorts against the host nation. The ICC also organises competitions that are for several countries at once, including the Cricket World Cup & ICC T20 World Cup.
World Series Cricket
World Series Cricket (WSC) was a break away professional cricket competition staged between 1977 and 1979 and organised by Kerry Packer for his Australian television network, Nine Network. The matches ran in opposition to established international cricket. World Series Cricket drastically changed the nature of cricket, and its influence continues to be felt today.