DDR4 SODIMM RAM is a compact version of DDR4 RAM. You can place this internal memory in smaller devices, such as laptops. With an extra DDR4 SODIMM RAM module, you can give your laptop some extra RAM to work with, which improves the speed of your device. Please check whether the working memory of your laptop is expandable, because not every laptop has this option. Make sure you buy the right kind for your device as well.