# Invitation Users can enter data into the system using an invitation. An invitation is roughly a template that indicates required and valid values that will be saved to the database. The invitation contains a list of fields that need to be completed by the user. Everything in the system needs an invitation to be created. Even invitations need an invitation. The subsections contain information on the types of Invitations, their structure, the fields it can have, and how to define them with different specifiers. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.openreview.net/reference/api-v2/entities/invitation.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.