def describe_apps(StackId=None, AppIds=None):
    """
    Requests a description of a specified set of apps.
    See also: AWS API Documentation
    
    
    :example: response = client.describe_apps(
        StackId='string',
        AppIds=[
            'string',
        ]
    )
    
    
    :type StackId: string
    :param StackId: The app stack ID. If you use this parameter, DescribeApps returns a description of the apps in the specified stack.

    :type AppIds: list
    :param AppIds: An array of app IDs for the apps to be described. If you use this parameter, DescribeApps returns a description of the specified apps. Otherwise, it returns a description of every app.
            (string) --
            

    :rtype: dict
    :return: {
        'Apps': [
            {
                'AppId': 'string',
                'StackId': 'string',
                'Shortname': 'string',
                'Name': 'string',
                'Description': 'string',
                'DataSources': [
                    {
                        'Type': 'string',
                        'Arn': 'string',
                        'DatabaseName': 'string'
                    },
                ],
                'Type': 'aws-flow-ruby'|'java'|'rails'|'php'|'nodejs'|'static'|'other',
                'AppSource': {
                    'Type': 'git'|'svn'|'archive'|'s3',
                    'Url': 'string',
                    'Username': 'string',
                    'Password': 'string',
                    'SshKey': 'string',
                    'Revision': 'string'
                },
                'Domains': [
                    'string',
                ],
                'EnableSsl': True|False,
                'SslConfiguration': {
                    'Certificate': 'string',
                    'PrivateKey': 'string',
                    'Chain': 'string'
                },
                'Attributes': {
                    'string': 'string'
                },
                'CreatedAt': 'string',
                'Environment': [
                    {
                        'Key': 'string',
                        'Value': 'string',
                        'Secure': True|False
                    },
                ]
            },
        ]
    }
    
    
    :returns: 
    For Amazon S3 bundles, set Username to the appropriate IAM access key ID.
    For HTTP bundles, Git repositories, and Subversion repositories, set Username to the user name.
    
    """
    pass
