The world championships is just one race - winner is world champion
There used to be a world cup, based on performance in the most prestigious 1-day races in Europe
Recently, the UCI introduced the Pro Tour to replace the World Cup as a season-long competition based on results in a wider range of races including the three grand tours.
This year, the organisers of the three grand tours have withdrawn their races from the Pro Tour for various reasons, so we are waiting to see what will happen exactly.