Unlike traditional laptops, 2-in-1s do not have a clamshell design. As an alternative, 2-in-1s can be converted to tablet PCs that allow natural inking and consumption of media. Despite Microsoft selling a "Tablet PC" version of Windows in 2001 that supported pen input, the concept has never taken off. In recent years, electronics have become smaller and more powerful, and active pen and capacitive touch have become more sophisticated. With its Surface line in 2012, Microsoft initiated the form factor, which was soon followed by most other manufacturers. Two-in-ones come in a variety of different types today. A detachable keyboard tablet, such as Microsoft's Surface Pro 8, and a 360-degree convertible (usually larger) tablet are among the most popular types. Besides being extremely thin, light, and easy to carry, tablets are also best for drawing and taking notes on their pen-enabled display - the main advantage of the 2-in-1 tablet. As for the 360-degree convertible 2-in-1, it's not quite as handy as a tablet, but it's more stable on the lap than most detachable tablets when used as a clamshell laptop.