Reference Material:

https://aws.amazon.com/certificate-manager/#:~:text=Use%20AWS%20Certificate%20Manager%20(ACM,and%20your%20internal%20connected%20resources.
Use AWS Certificate Manager (ACM) to provision, manage, and deploy public and private SSL/TLS certificates for use with AWS services and your internal connected resources. ACM removes the time-consuming manual process of purchasing, uploading, and renewing SSL/TLS certificates.
To use SSL/ TLS encryption, you need to setup and assign the SSL/ TLS certificates first.