RAM is Also Known As main memory, internal memory, primary storage, memory "stick", RAM "stick".

an imageRandom access memory is a kind of computer data storage which makes it possible to access data in random order, RAM is used by central processing unit (CPU) to store information that needs to be used very quickly, find a specific piece of information very fast but it does not store any information permanently that’s reason Sometimes RAM is considered as volatile memory means it loses its contents or data even when computer is turn off.Ram devices are used in computer systems as the main memory.RAM chip may be individually mounted on the motherboard or in sets of several chips on a small board connected to the motherboard. Every time computer users open a program, it gets loaded from the hard drive into the RAM. This is because reading data from the RAM is much faster than reading data from the hard drive. Running programs from the RAM of the computer allows them to function without any lag time. The more RAM your computer has, the more data can be loaded from the hard drive into the RAM, which can effectively speed up your computer. In fact, adding RAM can be more beneficial to your computer's performance than upgrading the CPU.

Random Access Memory (RAM) is the "working memory" in a computer. Additional RAM allows a computer to work with more information at the same time which can have a dramatic effect on total system performance.

Types of RAM: There are two main types of RAM: dynamic random access memory (DRAM), or Dynamic RAM, and static random access memory (SRAM). The RAM in most personal computers (PC’s) is Dynamic RAM. All dynamic RAM chips on DIMMs, SIMMs or RIMMs have to refresh every few milliseconds by rewriting the data to the module. The three main memory circuit boards types containing chips are: RIMMs (Rambus in-line memory modules), DIMMs (dual in-line memory modules) and SIMMs (single in-line memory modules). Most motherboards today use DIMMs. Static SRAM refers to fact that it maintains its current state without having to be refreshed on a regular Basis. Static RAM (SRAM) is volatile memory and is often used in cache memory and registers because it is a lot faster and does not require refreshing like Dynamic RAM. SRAM retains information and is able to operate at higher speeds than DRAM. Because DRAM is a lot cheaper than SRAM, it's common to see PC manufacturers use DRAM. There are many different models of RAM available, but the overwhelming majority of memory available for home PCs currently falls into two main categories:

DDR2 (clock doubled): this is the older type of memory. It is generally cheaper but is gradually being phased out in favor of DDR3, so if you are buying a new Motherboard, go with DDR3 if you want to keep your options open for future expansion. I would advise only using DDR2 if you will be using a existing motherboard which requires it.DDR3 (clock trebled): DDR3 is the latest incarnation of memory chips. It is generally available in quicker speeds but you do have to pay more for it. The majority of new Motherboards are now switching to DDR3 Within both DDR2 and DDR3, you will see a number of different speeds (-specified in megahertz or MHz): the higher the MHz value, the faster the RAM. So, for example, both DDR2 and DDR3 are available running at speeds of 1066MHz, 1333MHz, and 1600MHz. In this example, 1600MHz is the fastest - and also the most expensive you should also pay attention to the latency values of the RAM: this is the delay in accessing RAM on the DIMM -and the lower the latency, the better the memory will perform. If you are adding RAM to a laptop, you are likely to need the smaller, SO-DIMMs whereas if you are adding it to a desktop/server, you almost certainly need 240-pin DIMMs. SO-DIMMs are incompatible with DIMMs - so make sure you order the correct type! Also, check the number of pins on your motherboard (-the norm is 240 pins for most DIMMs currently, but older motherboards can have differing numbers)