What Does Self Transfer Mean - It means that, instead of having a ticket from a to c via b, you have two separate tickets, one from a to b, and one from a to c. Two different airlines could operate the two flights, but not always. It's also possible that your second flight leaves from another airport to the one you arrived at (we'll always make this clear).
Two different airlines could operate the two flights, but not always. It's also possible that your second flight leaves from another airport to the one you arrived at (we'll always make this clear). It means that, instead of having a ticket from a to c via b, you have two separate tickets, one from a to b, and one from a to c.