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A legacy system is an outdated computer system, software, or technology that is still in use despite the availability of newer, more advanced alternatives. These systems are often built on older hardware or programming languages and can be difficult and expensive to update, though they may still perform their original functions reliably. Examples include old operating systems like Windows XP or applications that have been running for a long time without significant upgrades.

Characteristics of a legacy system

Outdated technology: Runs on older hardware, software platforms, or programming languages that are no longer the current standard.

Still in use: Continues to perform its original intended function within an organization.

Lack of support: May no longer receive security updates or ongoing development from the vendor.

Costly to maintain: Can be expensive to keep running due to a lack of support, complex integration needs, and difficulty finding personnel with the required skill sets.

Limits competitiveness: Can hinder a company's ability to stay competitive due to limitations and an inability to integrate with modern systems.