2. Take BMW as an example: BMW is a German automobile brand and belongs to BMW Group.
3. There are four models, I, X, Z and pure digital, 1, 2 and 3 series. M series (BMW's official high-performance modification department) is improved on the basis of various series.
4. BMW, the symbol of BMW, means Bavarian engine factory. The color and combination of the logo come from the state emblem of Bavaria where BMW is located.