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 A “repair job” for a piece of programming; also known as a “fix”. A patch is the immediate solution to an identified problem that is provided to users; it can sometimes be downloaded from the software maker’s Web site. The patch is not necessarily the best solution for the problem, and the product developers often find a better solution to provide when they package the product for its next release. A patch is usually developed and distributed as a replacement for or an insertion in compiled code (that is, in a binary file or object module). In many operating systems, a special program is provided to manage and track the installation of patches. 

See the following under Patch for more information: 
NIST SP 800-45 Version 2
NIST SP 800-44 Version 2

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