A legacy system is an integrated suite of business applications for virtually every department,process,and industry that allows companies to integrate information across operations on a company-wide basis using one large database.

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A legacy system refers to outdated computer systems, programming languages, or application software that are used instead of available upgraded versions. The description given aligns more closely with an Enterprise Resource Planning (ERP) system, which integrates various functions into one complete system to streamline processes and information across the organization.

A Legacy System Is an Integrated Suite of Business Applications