There is a difference between a round the world airfare (RTW) and a multi-stop flight created through the combination of multiple one-way tickets to create a round the world itinerary.
Round the World Airfares take advantage of airlines that work together within the various airline alliances that exist. Star Alliance, One World and Sky Team for instance. There are rules around each of these fares about travelling in a single direction around the world and travelling a certain number of miles or stops across your preferred trip. If your adventure plans coincide with one of these fares, then they are a great way to get around this planet of ours on one ticket.
Don't worry, if you preferred itinerary doesn't fit into a traditional round the world airfare alliance, that's ok. We will just create one that does!