def describe_clusters(clusters=None):
    """
    Describes one or more of your clusters.
    See also: AWS API Documentation
    
    Examples
    This example provides a description of the specified cluster in your default region.
    Expected Output:
    
    :example: response = client.describe_clusters(
        clusters=[
            'string',
        ]
    )
    
    
    :type clusters: list
    :param clusters: A list of up to 100 cluster names or full cluster Amazon Resource Name (ARN) entries. If you do not specify a cluster, the default cluster is assumed.
            (string) --
            

    :rtype: dict
    :return: {
        'clusters': [
            {
                'clusterArn': 'string',
                'clusterName': 'string',
                'status': 'string',
                'registeredContainerInstancesCount': 123,
                'runningTasksCount': 123,
                'pendingTasksCount': 123,
                'activeServicesCount': 123
            },
        ],
        'failures': [
            {
                'arn': 'string',
                'reason': 'string'
            },
        ]
    }
    
    
    """
    pass
