UTF stands for uniform transformation format and the 8 means that it uses 8 bit blocks, which is 1 byte, and this symbolises each character. The number of blocks that is needed to symbolise each character ranges between 1 - 4. UTF is a compromise character encoding. The nice thing about UTF is that no character will have zero bytes when it is encoded. UTF will always be a compatible encoding system as long as there are no characters longer than 127 presented directly.
(http:/www.fileformat.info/info/unicode/utf8.htm (visited 07-06-2013))
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