DDR2 stands for Double Data Rate 2 Synchronous Dynamic Random Access Memory. It is a type of computer memory that allows for faster data transfer rates compared to its predecessor, DDR. DDR2 achieves this by transferring data on both the rising and falling edges of the clock signal, effectively doubling the data rate. Introduced in the early 2000s, DDR2 memory is commonly used in various computing devices, including desktops and laptops. It operates at lower voltage levels than DDR, which helps reduce power consumption and heat generation, making it more efficient for modern computing needs.