Adds or overwrites one or more tags for the specified Amazon EC2 resource or resources. Each resource can have a maximum of 50 tags. Each tag consists of a key and optional value. Tag keys must be unique per resource.
For more information about tags, see Tagging Your Resources (http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/Using_Tags.html) in the Amazon Elastic Compute Cloud User Guide. For more information about creating IAM policies that control users' access to resources based on tags, see Supported Resource-Level Permissions for Amazon EC2 API Actions (http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-supported-iam-actions-resources.html) in the Amazon Elastic Compute Cloud User Guide.