by 
The Curious Bag
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A computer uses RAM (Random Access Memory) installed in "sticks" on the motherboard. RAM acts as a temporary space for rapid retrieval and storage of commonly accessed data. One type of RAM is the DDR DIMM.
DDR
DDR stands for Double Data Rate. Data rate is measured by a clock cycle whose speed moves according to the megahertz of the RAM. DDR transfers data twice per clock cycle, instead of once.
DIMM
DIMM stands for Dual Inline Memory Module. A "memory module" is the technical name for the "stick" that fits into slots on your motherboard. "Dual inline" means that the module is 64-bit, whereas SIMMs (Single Inline) are 32-bit.
Memory Bit Widths
A SIMM has a 32-bit "data path." This is like 32 "lanes" of traffic. A DIMM is 64-bit, so its data path is doubled. More information can be processed in a given amount of time.
Data Path Processing
CPUs (Central Processing Units) starting with the Pentium had 64-bit data paths. In order to keep up, you had to install two SIMMs at a time. DIMMs eliminated this problem and allowed for an odd number of RAM slots.
Other Types of DIMM
There is also an "ECC" DIMM, for Error Correction Codes. These are mostly used in servers, where errors can cause a cascade of problems if not caught quickly. "SO" (Small Outline) DIMMs are used in laptops, where physical space is at a premium.
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