> ## Documentation Index
> Fetch the complete documentation index at: https://signatureapi-daf4ee54.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Concepts

> Learn the core concepts of SignatureAPI including envelopes, documents, recipients, ceremonies, and deliverables

SignatureAPI organizes the document signing process around five core concepts:

```mermaid theme={null}
flowchart LR
    subgraph Envelope
        B[Documents]
        C[Recipients]
    end
    C -- review and sign Documents during --> D[Ceremony]
    D -- after completion generates --> E[Deliverable]
```

## Envelope

An [Envelope](/docs/api/resources/envelopes/object) is a container that holds documents and recipients. It organizes and tracks the entire signing workflow from creation to completion.

## Documents

[Documents](/docs/api/resources/documents/object) are the files within an envelope that recipients need to review and sign. You can provide PDFs directly or generate documents from [templates](/docs/api/resources/documents/templates) with dynamic data.

## Recipients

[Recipients](/docs/api/resources/recipients/object) are the people who interact with the envelope. Each recipient has a [type](/docs/api/resources/recipients/object#types) (signer, approver, or preparer) that determines what actions they can perform.

## Ceremony

A [Ceremony](/docs/api/resources/ceremonies/object) is a guided session in which a recipient reviews the documents and performs their required actions, such as signing. Each recipient completes their own ceremony, and you can control the [signing order](/docs/api/resources/envelopes/routing) (parallel or sequential).

## Deliverable

After all [recipients have completed](/docs/api/resources/recipients/lifecycle) their actions, the [envelope is completed](/docs/api/resources/envelopes/lifecycle). A [Deliverable](/docs/api/resources/deliverables/object) is then generated, containing the signed documents and an audit log. The deliverable is sent to the recipients and is available for download via the API.