What BEST describes double data rate memory?

Double data rate (DDR) memory is a type of synchronous dynamic random-access memory (SDRAM) that allows data to be transferred on both the rising and falling edges of the clock cycle, effectively doubling the data transfer rate compared to its predecessor, single data rate (SDR) memory. This design enhances overall performance and bandwidth, making DDR memory widely used in computers, graphics cards, and other devices. Different generations of DDR, such as DDR2, DDR3, DDR4, and DDR5, offer varying speeds and efficiencies.