The `set_metadata` method in `boto.s3.key.Key` class in Python's Boto library is used to set or update the metadata associated with an Amazon S3 object. Metadata is a set of key-value pairs that provide additional information about the object, such as its content type or author. By using this method, you can modify or add new metadata to an existing S3 object. This allows for better organization and management of your objects in the Amazon S3 storage system.
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