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Since 24.4, modules can be ordered for an organisation. A module consists of 1 or more Module Plugins that add extra functionality to the system. A plugin can be shared with multiple modules. A module can also be active for all organisations.
Schematic
This is better illustrated in the following graph
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Organisation A is linked with Module Modules A and B, which means that Plugin A and B are active
Organisation B is linked with Module Modules B and C, which means that Plugin Plugins A, B and C are active
Organisation C is linked with Module B, which means that Plugin B is active
Plugin A is shared with Module Modules A and C
Module B is active for all organisations