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On its most abstract level, VisualVM is simply a tool for displaying data. By default, it displays data relating to applications, hosts, dumps, and snapshots. However, it could, theoretically, display any data at all (photos, for example), although the intention of the tool is for it to deal with monitoring and management data. The reason that it can work with any kind of data is the fact that its APIs are created with pluggability in mind. Pretty much everything is pluggable and that's the point—VisualVM is intended to cater to all your monitoring/management data needs.