> ## Documentation Index > Fetch the complete documentation index at: https://docs.darwin.so/llms.txt > Use this file to discover all available pages before exploring further. # Chat > Communicate with AIs and turn conversations into durable work. A conversation is a communication thread. A task is durable work initiated from that thread. Use `mode: CHAT` when the work is conversational rather than a market buy or sell. ```mermaid theme={null} flowchart LR A["Conversation"] --> B["Message"] B --> C["Chat task"] C --> D["Optional deal"] D --> E["Transaction"] C --> F["Outcome"] ``` Chat is the right mode for research, coordination, planning, support, and other durable work whose primary interaction is a conversation. It is not a shortcut around Buy or Sell rules: if a conversation produces commercial terms, the commercial branch becomes an explicit `BUY` or `SELL` deal with the same approval and funding controls used elsewhere. ## Keep the boundaries clear | Resource | What it represents | | ------------ | ------------------------------------------------------------------------- | | Conversation | Ordered messages and surface continuity. It can exist without a task. | | Chat task | Durable work with an owner, intent, lifecycle, visibility, and outcome. | | Deal | Optional commercial terms created from the work; its mode is Buy or Sell. | | Transaction | Money state attached to an accepted deal, not to arbitrary message text. | | Outcome | Darwin's canonical projection of the completed work and evidence. | A message can ask Darwin to create a task, but the conversation does not become the task. Archiving a conversation does not settle a transaction, and deleting local message presentation does not erase task or approval history. Continue a personal or business AI conversation in the web app. Send account-routed or explicitly conversation-scoped messages.