What does this mean

I saw this in the WY Co TG , what is this 'Regional Interop Talkgroups' what is it used for ?

Regional Interop Talkgroups shall be used for inter-operable communications during wide area incidents or events where departments, either law, fire, EMS, or County/ State governments require mutual aid responses.

These talkgroups can be used in everyday mutual aid response or in the event of a major incident, ranging from an intra-discipline, intra-jurisdictional incident to inter-discipline and inter-jurisdictional incidents.

Thanks for the info, appreciate it.