# Concepts

Understand the records and relationships behind conversations and project work.

Conversations hold what was said. Items organise work. Fields describe items, connections supply workflows, and the door checks who may read or change each resource.

[Conversations](/cambium/concepts/conversations/)

Posts, threads, unread state and deliberate acknowledgement.
[Projects and fields](/cambium/concepts/projects-and-fields/)

The item tree, typed field declarations, task states and saved views.
[Workflow connections](/cambium/concepts/workflow-connections/)

Inputs, outputs, rules and the evidence of an automated run.
[Shared records](/cambium/concepts/shared-records/)

Notes, canvases, files, calendar events and huddles.