Files
A host keeps everything on disc, under the datahoster-config-contentRoot path, as plain folders and JSON files. The names that begin with datahoster- are the fixed ones the host looks for; the names between them are yours - a domain, a collection, a column, a user, an endpoint. This page lists every fixed name inside a data host, what it holds, and the usage pages that describe it. Each is also a record in the reference search. The local client config file lives on your own machine, and the server's on-disc storage files are covered in the internals.
Fixed names
A folder links to the page that documents it; a file links to the page that describes its contents. The names your own data supplies - the domain, collection, column, user and endpoint folders - are covered on those usage pages.