DDR may refer to any of the following:
1. Short for double data rate, DDR is memory that was first introduced in 1996 and has since been replaced by DDR2. DDR utilizes both the rising and falling edge of the system clock, potentially doubling the speed of the memory. Today, DDR technology is found on high-end video cards and computer memory such as DDR-SDRAM.
The original DDR may sometimes be called DDR1.
3. Short for Dance Dance Revolution, DDR is a popular arcade and console game where users must move their feet on a pad in conjunction with dance moves displayed on a screen.