RAMRAM (often called "memory") is the super-fast, volatile memory inside the computer. "Volatile" means that when the power is turned off, the memory disappears. ("Storage" is different: storage is hard drives, floppies, or Optical discs, which keep their memory even after the power is turned off.)
RAM is like the workspace area for the CPU. If you have more workspace, you can do more jobs. For example, let's say your kitchen is very small, and you only have 10cm2 of free counter space. You will only be able to have a few small items in that space. To get extra items, you will have to walk back and forth to cabinets and the refrigerator, which slows down your cooking. A bigger working space means you can do more work, more quickly.
Computers are the same. If you have little RAM, your computer can only run one or two programs quickly. But if you open up more than that, your computer slows down quite a bit!
In order to get the best speed from your computer, you should have as much RAM as you can afford.
Most computers are sold with the MINIMUM USABLE AMOUNT OF RAM, in order to make the price of the whole computer seem lower. It is enough to run the computer, but not enough for all of your present and future needs.
So you will probably have to buy EXTRA RAM when you buy your computer. Some of the cheaper computers you buy today only have 1 GB of RAM. Today, a total of 1 GB RAM is perhaps the smallest amount of RAM you can have if you want to use the latest operating systems. It is enough for Windows XP, but not really enough for Windows Vista. If you run only one or two programs at one time, then maybe this is good enough for you. However, if you need to run more software, or software which is memory-intensive, then it may not be enough.
Furthermore, you will need to use your computer for at least three years, if you're an average person--probably longer. That means you will have to buy new software in the future, and new software always requires more RAM. Even if your RAM is good enough for today, it will not be enough for your computer in a few years' time.
Therefore, when you buy a new computer, it is always best to increase your RAM! I would suggest you upgrade to at least 2 GB of total RAM, or to 3GB if the computer has 2GB to start with--add at least 1 GB extra (cost: about ¥8000), but if you can afford more, buy more. Not only will more RAM let you run more programs at the same time, but it will let you upgrade to future software without speed problems. It will also increase the possible sale value of your computer if you want to sell it the next time you buy a new computer.
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