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DDR RAM stands for "Double Data Rate Random Access Memory.""Double Data Rate" means that it can fetch data on both the up and the down cycles of the clock, unlike the previous versions of RAM which only fetched on one clock edge.The original DDR RAM was, very simply, exactly like the old SD RAM but with the speed at which it could transfer data doubled by transferring on both clock edges.DDR2 RAM added a 2x clock multiplier to the module, which meant the bus clock running at the same speed as DDR RAM would be doubled, thus multiplying transfer speeds by 2 for the same bus speed.DDR3 RAM replaces the 2x clock multiplier with a 4x clock multiplier, thus running at 4 times the memory transfer rate for the same bus speed as the original DDR RAM.Additionally, DDR2 is capable of running at a lower voltage than DDR, and DDR3 is again capable of running at a lower voltage than DDR2.Update: Original question only asked about 1, 2 and 3, not 4. Finding details about DDR4 that can succinctly describe the difference isn't a particularly simple task. What I can find so far is that DDR4 runs on a lower voltage than DDR3, is capable of running at a higher clock speed (typical DDR3 is 1600MHz for desktop, 1333 for laptop, while typical DDR4 may be 1866 for laptop and 2133 for desktop), and can more easily come in much more dense packages (DDR3 maxes out at 16GB/DIMM slot, DDR4 may end up maxing out at 128GB/DIMM slot).There's also differences in package and command coding, but altogether DDR4 standards aren't quite done being defined yet.

Yes, you can use these two RAM in your computer at same time .You are right about mixing different RAM modules .There's absolutely one thing which we can't mixDDR with DDR 2DDR 2 with DDR 3DDR 3'with DDR 4And so on, mixing RAM'S are slightly different matter .Speed matching is not that easy .In your case both 1866mah and 1600mah RAM both are DDR3 type .So , mixing (using at same time )these two RAM'S in your computer will won't lead to any issues (if your os doesn't support then it may lead to miscommunication).Any queries.Let me know.

RAM is hardware, made of physical objects - it cannot be downloaded. You could buy RAM in an online shop, and they will deliver it to you by post just like any other piece of hardware. The important things are to make sure that the RAM is compatible with your motherboard, to make sure that you have free RAM slots to plug the new RAM into, and the form factor - laptops use a compact form factor called SO-DIMM, desktop motherboards use a different shape of RAM module. There are various types of RAM - very old PCs like my 2007 desktop use DDR-2, most modern motherboards use DDR-4. DDR-4 will not work in a DDR-2 slot, AFAIK, and vice versa.