# Create your first contract

When Data Mover acts as a **client**, the following contract types can be created:

* **Input Contracts** define how Data Mover will retrieve files from the Producer’s data store. See the [Create an Input Contract](/data-mover-1.21/contracts/create-your-first-contract/create-an-input-contract.md) page for details. 
* **Output Contracts** define how Data Mover will send processed files to the Consumer's data store. See the [Create an Output Contract](/data-mover-1.21/contracts/create-your-first-contract/create-an-output-contract.md) page for details. 

When Data Mover acts as a **server**, one type of Contract can be created:

* **Connection Contract** (in input or in output) specifies how Data Mover will connect with the Producer to receive files or with the Consumer to retrieve files, acting as a protocol server in both scenarios. See the [Create a Connection Contract](/data-mover-1.21/contracts/create-your-first-contract/create-a-connection-contract.md) page for details. 

When data transformation is needed, one type of contract applies: 

* The **Mediation Contract** defines if and how Data Mover will apply changes to the files, for example how to rename or zip them, before delivery. See the [Create a Mediation Contract](/data-mover-1.21/contracts/create-your-first-contract/create-a-mediation-contract.md) page for details. 

The following pages deal with the creation of these 4 types of contracts. 


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