Rally can refer to many things. This one is about the motorsport "rally",
action "rallying / rally racing"
Rally is a motorsport, where different drivers and
teams compete against each other by doing the best times.
1 rally usually takes place in 1 certain place (
country, county etc) and there are different stages, that also take places in different places inside the area chosen (
country, county etc). Drivers start to stages with intervals (usually 1-5 minutes). Whoever is the fastest overall wins the rally.
There are also rally championships, that hold many rallies in it. Usually championship winners are determined by the points they collect with the rallies.