Which service helps to migrate databases to AWS?

The AWS Database Migration Service (DMS) is specifically designed to assist users in migrating databases to AWS. It supports a wide range of source and target database engines, allowing for seamless migration with minimal downtime. DMS enables users to migrate databases from on-premises environments or other cloud providers directly into AWS, making the migration process straightforward and efficient. It also provides the capability to continuously replicate data, which is vital for ensuring that the databases on AWS remain synchronized with the source databases during the migration process.

In contrast, while the other services listed have their own functionalities, they do not focus on database migration. AWS Snowball is primarily used for transferring large amounts of data to AWS, making it more suitable for bulk data transfers rather than database migrations. AWS CloudFormation facilitates the automation and management of infrastructure as code but does not specifically assist in database migrations. AWS Lambda is a serverless computing service that allows you to run code in response to events but does not provide functionality for migrating databases. Hence, the AWS Database Migration Service is the most appropriate choice for this specific task.