hexadecimal
Also known as:
hex
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Hexadecimal refers to the base-16 number system, which is commonly used on computers and to represent colors on web pages. You are probably familiar with the base-10 number system, in which a number like 472 means 4 one-hundreds, 7 tens and 2 ones. The places from the right to the left are worth 1, 10, 100, 1000, 10000, and so on. These are all powers of 10, i.e. 100=1, 101=10, 102=100, 103=1000, and so on. Any number can be used as the base of a number system. In hexadecimal (base-16) the places from right to left are worth 1, 16, 256, 4096, etc., so 472hex would mean 4 two-hundred-fifty-sixes, 7 sixteens and 2 ones. But how to you write the number ten or eleven in hexadecimal? The numeral symbols only go up to “9”. In hex, the numbers ten to fifteen are written as A-F. Counting to sixteen in hexadecimal looks like this: 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, 10. Remember that 10hex means 1 sixteen and 0 ones.
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HTTP
Also known as:
hyper text transfer protocol
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HTTP is the standard protocol for sending and receiving web pages (hyper-text). When you go to a web page, your browser makes an HTTP request for the page to the web server. The server responds with an HTTP response which indicates the status code of the request, the content-type of the request, etc., and the page data itself.
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