Iconic logo design doesn't come much better than BMW. Having this badge attached to a motor vehicle is a sign of quality, and has been ever since the 1920s. The popularity of BMWs has never really wavered in the past century, and they're as desirable (and expensive) now as they always have been. That internationally famous blue and white logo isn't just there to look pretty though - it's telling us about the past of the company.
Blue and white are the colors of the flag of Bavaria. That's the region of Germany within which BMW was founded, and so represents their close ties with their homeland. The four sectors in the center of the logo, surrounded by a circle, are supposed to look like propeller blades. That's down to something that not many people know about BMW - in their early days the company was as interested in making planes as it was with cars. Their focus changed over the years, but their logo never has.