A laptop is a compromise. It tries to be as powerful as a desktop, and as light and portable as tablet but it ends up as something in between. Modern laptops can do almost anything a desktop computer can do, though the smaller and lighter the laptop the less powerful it is likely to be. Also the screen and the keyboard are less suitable for extensive use. Another disadvantage of a laptop is that the parts are not easily replaceable. However, a laptop can be carried in a briefcase or backpack, and a desktop computer can't be.