Explain what is Regions and Endpoints in AWS?

To reduce data latency in your applications, most Amazon Web Services products allow you to select a regional endpoint to make your requests. An endpoint is a URL that is the entry point for a web service. For example, https://dynamodb.us-west-2.amazonaws.com is an entry point for the Amazon DynamoDB service.
Some services, such as IAM, do not support regions; their endpoints therefore do not include a region. A few services, such as Amazon EC2, let you specify an endpoint that does not include a specific region, for example, https://ec2.amazonaws.com. In that case, AWS routes the endpoint to us-east-1.