What is the difference between v_plugin.list and sys_plugins.list?

What is the difference between the v_plugin table and the sys_plugins table?  I know many of us know to look under System Definition > Plugins.  That is the v_plugin list.  I've recently become aware of the sys_plugins.list though.  Using the schema map, I don't see that they're related in any way, but I see similar data in each of these tables.