Hard drive: This is the storage capacity of the computer and is measured in gigabytes, generally ranging from 10 to 30. Processor: There are various levels of microprocessors and the best-known manufacturer is Intel. The processor determines the working speed of the computer, but recent levels are all very advanced and you don't necessarily need the latest one. RAM: How much information or how many applications you can open up at a given time is determined by RAM. It's measured in megabytes and a minimum of 64 is fine for normal use, right up to 384 for those who would be using complex graphics applications and programs such as Computer-Aided Design. CD Rom: This is essential, as most software now comes on CD. The CD drive allows you to insert and read CDs that carry computer programs, music or information. DVD: This is where the magic word multimedia really comes to life. DVDs look like CDs but they are higher capacity, and are currently entertainment centred, eg films and games. CD writer: This is a peripheral device that you plug in when you need it. The writer allows the user to record (burn) their own CDs or store information. Graphics card: This determines the extent or resolution of the graphics you use. Monitor: 15-, 17-, 19- and 21inch, and generally speaking the bigger the better, but not if you want the computer to be unobtrusive. Flat panel monitors are now available - they take up less space and are very trendy, but expensive. Modem: What you use to connect to the Internet. It's measured in thousands of bits per second (Kbps). Since early 1998 most new PCs come with 56 Kbps modems.