AWS Certificate Manager is a service that lets you set an SSL certificate for free, an alternative to letsencrypt. It issues the certificate for a year, unlike letsencrypt that needs to be renewed after several month. However it only support the following services: Elastic Load Balancing, CloudFront, Elastic Beanstalk, API Gateway and CloudFormation.

See following URL for more information:

https://aws.amazon.com/certificate-manager/

https://docs.aws.amazon.com/acm/latest/userguide/acm-services.html