+A legacy system is an outdated computing method or application that remains in use due to its critical function or high replacement cost. Though often stable, these systems can hinder [Innovation](/wiki/innovation) and complicate integration with modern [Architecture](/wiki/architecture). They are a testament to enduring function, despite their age.
+## See also
+- [Technical Debt](/wiki/technical_debt)
+- [Modernization](/wiki/modernization)
+- [Migration](/wiki/migration)
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