Which moon is the only satellite in our solar system to possess a dense atmosphere?

The moon Titan is the only satellite in our solar system to possess a dense atmosphere. Its atmosphere primarily consists of nitrogen, similar to Earth's atmosphere, along with trace amounts of other gases such as methane. This dense atmosphere sets Titan apart from other moons and satellites, making it a unique and intriguing celestial body for scientific study. In fact, the presence of its atmosphere has led to the discovery of lakes and rivers of liquid hydrocarbons on Titan's surface, further adding to its distinction.