A dynamic random access memory is provided, including a main body and a transmission port. The main body has a substrate, a light-emitting module and a light-guiding portion. The substrate is provided with a memory module, the light-emitting module has a carrier board and a light-emitting portion disposed on the carrier board, the light-guiding portion is arranged corresponding to the light-emitting portion, and at least a part of light from the light-emitting portion is projected to outside of the dynamic random access memory through the light-guiding portion. The transmission port is disposed on the substrate, and the transmission port is electrically connected with the memory module.