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The DataContractJsonSerializer class is used to deserialize JSON documents into .NET objects, which is crucial for applications that need to work with data exchanged in JSON format. This class makes it very easy to convert JSON data into strongly typed objects by leveraging the .NET serialization mechanism.

When consuming JSON documents, developers can define data contracts using attributes to control which members are serialized and deserialized. This adds flexibility since you can precisely control how JSON data maps to C# objects. The DataContractJsonSerializer works seamlessly with other serialization techniques, allowing for easy integration where necessary.

While there are other classes available for handling JSON in C#, such as `JsonSerializer` and `JsonConvert`, used primarily for converting between complex objects and JSON syntax, the DataContractJsonSerializer is particularly designed for scenarios where you need a direct binding between JSON documents and .NET classes through the data contract model.