R/2 is a set of coordinated business applications from SAP, a German company that introduced the product in 1979. R/2 gained popularity until the mid-1990s, when it was superseded by the more capable R/3 product, later updated by mySAP.com. To some extent, R/2 is still in use.
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Now more than 20 years old, R/2 continues to be supported by SAP, although support is expected to decline. Using Application Link Enabled (ALE) technology, R/2 systems can share data with R/3 and mySAP.com-equipped systems. However, SAP says that it may more cost-effective to migrate to R/3 rather than to stay with R/2, because of the improved support and expanded features available with the current product.