Which service can be used to manage user access and permissions in AWS?

AWS Identity and Access Management (IAM) is the correct service for managing user access and permissions in AWS. IAM allows you to create and manage AWS users and groups and set permissions to allow or deny their access to AWS resources. With IAM, you can implement security best practices by ensuring that only authorized users have access to certain functions within your AWS account.

By using IAM, you can assign policies that define specific permissions for users and groups, thereby providing granular control over AWS resources. This means you can specify who can do what with which resource, significantly enhancing the security posture of your AWS environment.

While other services mentioned, such as Amazon Route 53, AWS CloudFormation, and Amazon CloudFront, play vital roles in the AWS ecosystem, they are not designed for user access and permission management. Route 53 is primarily a Domain Name System (DNS) web service, AWS CloudFormation is used for deploying and managing resources as infrastructure as code, and Amazon CloudFront is a content delivery network (CDN) service that speeds up the distribution of static and dynamic web content. These services do not provide the functionalities required to manage user access and permissions effectively, which makes IAM the appropriate choice for that purpose.