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    <p>Entropy can mean different things:</p> <p><a href="http://en.wikipedia.org/wiki/Entropy_(computing)" rel="noreferrer"><strong>Computing</strong></a></p> <blockquote> <p>In computing, entropy is the randomness collected by an operating system or application for use in cryptography or other uses that require random data. This randomness is often collected from hardware sources, either pre-existing ones such as mouse movements or specially provided randomness generators.</p> </blockquote> <p><a href="http://en.wikipedia.org/wiki/Entropy_(information_theory)" rel="noreferrer"><strong>Information theory</strong></a></p> <blockquote> <p>In information theory, entropy is a measure of the uncertainty associated with a random variable. The term by itself in this context usually refers to the Shannon entropy, which quantifies, in the sense of an expected value, the information contained in a message, usually in units such as bits. Equivalently, the Shannon entropy is a measure of the average information content one is missing when one does not know the value of the random variable</p> </blockquote> <p><strong>Entropy in data compression</strong></p> <p>Entropy in data compression may denote the randomness of the data that you are inputing to the compression algorithm. The more the entropy, the lesser the compression ratio. That means the more random the text is, the lesser you can compress it.</p> <blockquote> <p>Shannon's entropy represents an absolute limit on the best possible lossless compression of any communication: treating messages to be encoded as a sequence of independent and identically-distributed random variables, Shannon's source coding theorem shows that, in the limit, the average length of the shortest possible representation to encode the messages in a given alphabet is their entropy divided by the logarithm of the number of symbols in the target alphabet.</p> </blockquote>
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    1. POWhat is the computer science definition of entropy?
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    1. USNiyaz
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    1. POWhat is the computer science definition of entropy?
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    1. COActually, those are three statements of the same thing.
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      1. USCharlie Martin
    2. COYes, and that thing is called entropy, which is why it's ambiguous.
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      1. USfluffels
    3. COAlso, if those blocks are quoted, you should probably reference them.
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