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Like the majority of large websites, Wikipedia has link rot, a condition in which external connections become inactive as the linked web pages or entire websites vanish, change their content, or relocate without using HTML redirection. This poses a serious danger to Wikipedia's citation of sources and reliability policy.

In general, don't remove references just because the source's website address is broken. As described in this document, there are available tools, steps, and processes.

Within roughly 24 hours, links added by editors to the English Wikipedia mainspace are automatically preserved to Wayback Machine (nb. in practise not every link is getting saved for various reasons). Internet Archive runs and maintains a tool named "NoMore404" to do this; other