With original DRAM you had the row strobe, the column strobe and then you could read out your data. You then had to precharge the row again before doing another

With original DRAM you had the row strobe, the column strobe and then you could read out your data. You then had to precharge the row again before doing another access. Page mode DRAM improved on this by allowing you to keep the row open and read multiple columns, but you had to wait until the read completed before presenting the next column address. Enhanced-data-out (EDO) DRAM extends this by allowing you to pipeline accesses with the row. So the ability to pipeline is much older than DDR. DDR SDRAM is an evolution on SDRAM, which is the first variety of DRAM that is actually clocked (and came after EDO); and the main innovation is transfer on both edges of the clock (falling as well as rising) - hence double-data-rate.