https://www.udemy.com/aws-certified-solutions-architect-associate/learn/v4/t/lecture/3814708?start=0

What are Tags

• Key Value Pairs attached to AWS resources
• Metadata (data about data)
• Tags can sometimes be inherited
  • Autoscaling, CloudFormation and Elastic Beanstalk can create other resources

What are Resource Groups

Resource Groups make it easy to group your resources using the tags that are assigned to them.  You can group resources that share one or more tags.

Resource groups contain information such as:

• Region
• Name
• Health Checks

Specific information:

• EC2: Public and Private IP Addresses
• ELB: Port Configurations
• RDS: Database Engine, etc.

Resource Groups can be organized/searched by

• Tag ‘Keys’
• Tag ‘Values’
  • Multiple keys and values per key can be used
• Region
• Resource Type (EC2, CloudFormation, ELB, etc.)