> For the complete documentation index, see [llms.txt](https://engine.place.technology/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://engine.place.technology/key-concepts/zones.md).

# Zones

*Zones* are collections of [systems](/key-concepts/systems.md). A system can be tagged as a member of any number of zones.

![Zones have settings and a collection of systems.](/files/-LZZ3h3uyjW3MAURDd1v)

They serve two main purposes:

1. Logical groupings of systems with common traits (such as those in the same building, or of the same basic type).
2. A point to define settings that compose across systems.