No Go Zones Officially Confirmed / No Go Areas do exist

This video contains a paid promotion spot for Virtual Shield in the beginning of the podcast.
In a recent press conference with Trump, Prime Minister Lovfen of Sweden stated they did no have “no go areas.” But what is a “no go zone” or “no go area” and does Sweden have them?
For the longest time people have disputed their existence but at least in Germany the idea has been officially recognized by Angela Merkel.