Which planet is known as the Red Planet?

Mars is referred to as the Red Planet primarily due to its reddish appearance, which is a result of iron oxide, commonly known as rust, on its surface. This characteristic hue has led to its association with the color red in various cultural contexts, such as in mythology and astronomy. As the fourth planet from the Sun, Mars has been a significant subject of study and fascination, particularly in the context of planetary exploration and the search for signs of past life. Its unique geological features and potential for having supported life also contribute to its importance in both scientific research and popular narratives.