Palm rejection is a feature that allows a device like a tablet to differentiate between a stylus or a fingertip and a palm or a wrist, effectively "rejecting" unwanted contact. It is the ability to rest your hand naturally on the screen while writing without making unwanted marks. A device and its software employ a variety of advanced algorithms to figure out which inputs are intended by the user. Palm rejection is an essential technology if you want to use your touchscreen without tearing your hair out at some point. It is a feature provided by the manufacturer of smart devices and is not controlled by specific apps. To enable palm rejection, you need to use an active stylus and turn on strict palm rejection. The best stylus pens for any tablet or laptop have palm rejection features that can be turned on or off depending on the app you are using.