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    <p>A <a href="http://en.wikipedia.org/wiki/Wrapper_library" rel="noreferrer">wrapper</a> is a bit of code that sits on top of other code to recycle it's functionality but with a different interface. This usually implies an interface written in the same language. It should also be noted that sometimes people will say wrapper when what they technically mean is a binding (myself included).</p> <p>Pros: </p> <ul> <li>It's in the same language as the original</li> <li>Wrappers enhance or reuse functionality without needing a full rewrite.</li> <li>Relatively quick to accomplish</li> <li>Trivial updates when the source library changes. You'll probably only need to bind new functions unless they broke backwards compatibility by changing expected input/outputs of functions/classes.</li> </ul> <p>Cons:</p> <ul> <li>Wrapping an entire library can be extremely repetitive</li> </ul> <p>A <a href="http://en.wikipedia.org/wiki/Language_binding" rel="noreferrer">binding</a> is another bit of code that sits on top of other code to recycle it's functionality except this time bindings are written in a language different than the thing they bind. A notable example is PyQt which is the python binding for QT.</p> <p>Pros:</p> <ul> <li>Bring functionality from another language into the language of your choice.</li> <li>Relatively fast in comparison to a port</li> <li>Same level of trivial changes are needed as in wrapping- You'll probably only need to wrap new functions/classes unless they broke backwards compatibility by changing expected input/outputs of functions/classes.</li> </ul> <p>Cons:</p> <ul> <li>Just as repetitive as a wrapper</li> <li>You're probably taking a fairly large performance hit, especially any wrapper involving an interpreted language on either end</li> </ul> <p>A <a href="http://en.wikipedia.org/wiki/Porting" rel="noreferrer">Port</a> is when you translate some code to work in a different environment. Common analogies include games that come out for say... XBox and are later released for PS3.</p> <p>Pros:</p> <ul> <li>Gives you the opportunity to make improvements to the code base as you see inadequacies</li> <li>You'll be intimately familiar with HOW the code runs, not just what it does.</li> </ul> <p>Cons:</p> <ul> <li>By far the lengthiest solution in terms of time/requires a complete rewrite</li> <li>You need to make sure that whatever functionality the source library needs in a language is available in your target port language or you'll end up wrapping needed functionality (and potentially defeating the purpose.)</li> <li>Every time the source library updates, you have to update too by translating whatever changes they made or risk falling behind.</li> </ul>
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    1. COGreat explanation!
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