Data is a measure of the amount of bits something contains, this is distinct
from information which
is really about useful data.
This is the information
that computers store, process and send to each other. This data may represent
anything, words, pictures, sounds,
a company payroll, a clients name and address, instructions for a milling machine,
a computer program.
Before information can be processed by digital computers it needs to be converted
into numbers. These numbers are sent to the computer in convenient pieces called
1 Byte = 8 bits
1 bit = smallest unit of information, can have 2 states representing 0 or 1, yes or no, on or off, etc.