Definition
iSeries was the brand IBM used after the AS/400 era to present the same business-computing lineage inside a broader e-business strategy. For buyers and searchers today, the important point is that iSeries, AS/400, System i, and IBM i often describe the same platform family across different time periods rather than completely different systems.
That naming overlap still affects software discovery, because vendor pages, job titles, and internal company language often use the older names interchangeably.