AWS Security Credentials
When you interact with AWS, you use AWS security credentials to verify who you are and whether you have permission to access the resources that you are requesting. In other words, security credentials are used to authenticate and authorize calls that you make to AWS.
Types of Security Credentials
Access keys (access key ID and secret access key)
Access keys consist of an access key ID (like AKIAIOSFODNN7EXAMPLE) and a secret access key (like wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY). You use access keys to sign programmatic requests that you make to AWS whether you're using the AWS SDK, REST, or Query APIs.... Access keys are also used with command line interfaces (CLIs).
Finally, under How Do I Get Security Credentials?
Access keys (access key ID and secret access key)
... You can create new access keys for the account by going to the Security Credentials page. In the Access Keys section, click Create New Access Key.