Dynamic Random Access Memory (DRAM) is the world’s most mainstream volatile main memory chip. Its core principle is to store binary data by using capacitors to hold electric charges. Since capacitors naturally leak electricity, data must be periodically refreshed approximately every 64ms to be maintained, which is the origin of the term “dynamic”. Compared with SRAM, DRAM has core advantages of extremely high storage density, extremely low cost per unit capacity and strong scalability, making it the only choice for large-capacity main memory in electronic systems. Mainstream generations include the currently widely used DDR4 and the new generation DDR5 (with speeds up to 8000MT/s and above). It is classified by application into consumer-grade UDIMM, server-grade RDIMM/LRDIMM and mobile LPDDR series. It is widely used in computers, laptops, mobile phones, servers, graphics cards and other devices as the core working memory for CPUs to temporarily store running programs and data.