# Actions

When communicating with IDOL Server, there are two main types of action:

- ACI (Autonomy Content Infrastructure) actions

- Index actions

ACI actions request information or perform operations and return results. Different IDOL components accept different ACI actions. For example, the `Query` action requests results from the IDOL Content component, while the `UserRead` action requests user information from the IDOL Community component.

Index actions maintain the IDOL Server data index. You use them to index data, delete data, and perform operations on the data in IDOL Server.

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