Double Data Rate (DDR) is a type of memory technology used in computer systems to improve data transfer speeds. It allows data to be sent on both the rising and falling edges of the clock signal, effectively doubling the amount of data transmitted per clock cycle compared to traditional single data rate (SDR) memory. This technology is commonly used in various types of RAM such as DDR3, DDR4, and DDR5, which are essential for enhancing the performance of computers, smartphones, and other electronic devices. By increasing bandwidth, DDR helps in faster processing and smoother multitasking.