What is AWS Certificate Manager (ACM)
AWS Certificate Manager is a service that lets you easily provision, manage, and deploy public and private Secure Sockets Layer/Transport Layer Security (SSL/TLS) certificates for use with AWS services and your internal connected resources.
Request a public certificate
AWS Management Console → Certificate Manager → Request a certificate
Step 1: Add domain names
Step 2: Select validation method
Step 3: Add tags
Step 4: Review
Step 5: Validation
Approve your certificate request
Check your email and you will receive a letter with the subject "Certificate approval for your.domain" from Amazon Certificates.
Click the "I Approve" button.
And then you'll get an SSL/TLS certificate.