Which planet is known as the Red Planet?

Mars is commonly known as the Red Planet due to its reddish appearance, which is caused by iron oxide, or rust, on its surface. This distinct color is easily recognizable and has been a significant factor in cultural references and scientific study. Mars has been a focus of exploration because of its similarities and contrasts to Earth, making it an intriguing subject for studies related to geology, potential past life, and future human exploration. The other planets mentioned do not possess the same characteristic hue, with Venus being known for its thick, cloudy atmosphere, Jupiter for its gas giant composition and notable bands, and Saturn primarily for its magnificent rings.