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Showing content from https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-resource-tags.html below:

AWS CloudFormation resource tagging - AWS CloudFormation

You can apply tags to resources by using the Tags property in your CloudFormation template, which can help you identify and categorize those resources.

For information about which resources support the Tags property, see the individual resources in the AWS resource and property types reference. If a resource doesn't yet support the Tags property, the resource's service might support tagging using its own API operations. For more information, refer to the documentation for that service.

In addition to any tags you define, CloudFormation automatically creates the following stack-level tags with the aws: prefix:

aws:cloudformation:logical-id
aws:cloudformation:stack-id
aws:cloudformation:stack-name

The aws: prefix is reserved for AWS use. This prefix is case-insensitive. If you use this prefix in the Key or Value property, you can't update or delete the tag. Tags with this prefix don't count toward the number of tags per resource.

The propagation of stack-level tags to resources, including tags with the aws: prefix, varies by resource type. For example, tags aren't propagated to Amazon EBS volumes that are created from block device mappings.

Note

Some resources require explicit tag propagation settings. For example, the AWS::AutoScaling::AutoScalingGroup resource must have its PropagateAtLaunch property set to true to propagate tags to its EC2 instances. However, stack-level tags are automatically applied to EC2 instances regardless of the PropagateAtLaunch setting.

Syntax JSON

{
  "Key" : String,
  "Value" : String
}

Properties

Key

The key name of the tag. You can specify a value that's 1 to 128 Unicode characters in length and can't be prefixed with aws:. You can use any of the following characters: the set of Unicode letters, digits, whitespace, _, ., :, /, =, +, @, -, and ".

Required: Yes

Type: String

Value

The value for the tag. You can specify a value that's 1 to 256 characters in length. You can use any of the following characters: the set of Unicode letters, digits, whitespace, _, ., /, =, +, and -.

Required: Yes

Type: String

This example shows a Tags property. You specify this property within the Properties section of a resource that supports it. When the resource is created, the Environment tag is dynamically set using a parameter, and the Owner tag is statically set to MyName.

JSON

"Tags" : [
   {
      "Key" : "Environment",
      "Value" : { "Ref": "Environment" }
   },
   {
      "Key" : "Owner",
      "Value" : "MyName"
   }
]

YAML

Tags: 
  - Key: Environment
    Value: !Ref Environment
  - Key: Owner
    Value: MyName