Munis means a person who works for a city, town, or local government.
Munis are important because they help make sure the city or town works well.
Examples:
The munis fixed the broken street light.
The munis pick up the trash every week.
I saw the munis driving the big truck.
The munis wear bright orange vests.
The munis keep the city clean and safe.
The munis are like the city's helpers.