ESD stands for Electrostatic Discharge. Static electricity is the energy found in the air surrounding us and can damage electronic components in computers' hard disk drive, floppy disk drive, memory modules, motherboards, etc. To protect memory modules from being damaged by ESD, always keep an electronic component in its anti-static package until you are ready to install it. For an added measure of protection, use an anti-static wrist strap, which can be found in most electronic retail stores.