AWS Database Migration Service (DMS) is a fully managed service provided by Amazon Web Services (AWS) that allows you to migrate your databases to and from the AWS cloud seamlessly. It helps you move data between different database platforms, versions, and operating systems, making it easier to adopt the AWS ecosystem while minimizing downtime and data loss during the migration process.

Key features and benefits of AWS Database Migration Service include:

1. Database Compatibility: DMS supports a wide range of databases, including Amazon Aurora, PostgreSQL, MySQL, MariaDB, Oracle, Microsoft SQL Server, and others. This enables you to migrate data between different database engines.

2. Continuous Data Replication: DMS supports both one-time and ongoing migrations. You can perform continuous replication of data from the source to the target database, minimizing downtime during the cutover phase.

3. Schema Conversion: DMS can automatically convert the source database schema to match the target database schema, easing the migration process when the database engines are different.

4. Data Validation and Integrity: DMS ensures that the data is migrated accurately and with integrity by validating the data before and after the migration.

5. Data Filtering and Transformation: DMS allows you to filter and transform the data during the migration process, providing flexibility in how data is moved and structured.

6. Minimized Downtime: With AWS DMS, you can perform most of the migration tasks without disrupting the ongoing operations, reducing downtime and ensuring business continuity.

7. Change Data Capture (CDC): DMS can use CDC to capture ongoing changes to the source database and replicate them to the target database in near real-time.

8. Highly Available and Secure: AWS DMS is built with high availability and data security in mind, providing encryption for data in transit and at rest.

9. Monitoring and Management: AWS DMS offers monitoring metrics and logging capabilities, making it easier to track the migration progress and troubleshoot any issues.

To use AWS Database Migration Service, you need to set up the necessary permissions, configure the source and target databases, create and run a replication instance, and define the migration tasks. AWS DMS can be accessed through the AWS Management Console, AWS Command Line Interface (CLI), or AWS SDKs.