• Pre-written generic code that helps you solve problems
• Some small group writes a library and ideally many people / projects use it
• Libraries can be domain specific (math, graphics, sound, etc)
• Can also help with general programming tasks (working with strings, arrays, etc)
• Can also solve really specific problems (read data out of a QR code)
• More like pre-built Lego structures
• Contains functions, constants, etc

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