outskirts vs. suburbs vs. exurbs

[Anzeigenhauptmeister]

What are the differences between those three terms?

[Anzeigenhauptmeister]

Thanks you both for your answers. The gist of my question is which of the three terms are part of the referred-to city.

I always thought the outskirts of a city lie on the fringes within the city, the suburbs are towns abutting on the city, and the exurbs are towns/villages within the city's sphere of influence.
But since checking the definitions of those terms, I'm not so sure anymore about the validity of my assumptions.