The Jargon File

Software Rot

When a piece of software hasn't been used (or maintained) for a while, eventually, it's functionality will decrease as the assumptions it makes about the world become outdated.

For example, one can still download Netscape Navigator and it still, technically, works even on modern hardware.  However, standards have changed, and it does not support modern HTML and Javacript, meaning it can no longer parse a large number of websites.
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