There's too much "stuff" on your computer's hard disk to use it all at the same time. During the average session sitting at the computer, you'll probably use only a small amount of all that's available. The stuff you're working with at any given moment is stored in random access memory (often abbreviated RAM, and often called simply "memory"). The advantage using RAM to store whatever you're working on at the moment is that RAM is very fast. Much faster than any disk. For you, "fast" translates to less time waiting and more time being productive
Abbreviation
Stands for
Spoken as
Approximate #
Actual #
K
Kilo kay or killa
1,000 (a thousand)
1,024
M
Mega
meg
1,000,000 (a million)
1,048,576
G
Giga
gig or giga
1,000,000,000 (a billion)
1,073,741,824
T=Tera=trillion
Example
Size
Or about...
The picture shown in Figure 1
61 KB
61,000 bytes
This entire Web page