Skiplagged is a travel search engine that helps users find a cheap flight by utilizing a strategy called "hidden city ticketing" or "throwaway ticketing." This strategy involves booking a flight with a layover at the user's desired destination. Still, instead of continuing to the final destination, the user exits the airport at the layover location. While Skiplagged is not illegal, airlines have attempted to crack down on this practice and may take action against users who engage in hidden city ticketing. It's important for users to be aware of the potential risks and consequences before utilizing this strategy for their next flight.