It is already known that there are different moons that come with atmospheres. Most of the atmospheres are thin though. Titan is different from all of the other moons available. This is dense and it is also rich in Nitrogen. What shocks people most about it is the fact that it also has clouds.
The type of atmosphere that it has is surely similar to the atmosphere of other planets. The fact that it has an atmosphere is still a mystery to a lot of people. Even those who have studied Titan for a lot of years will have no answer to this. Perhaps this will become clearer in the future.