RDS server typically refers to an Amazon Web Services (AWS) service called Amazon Relational Database Service (RDS). It is a managed database service that allows you to set up, operate, and scale relational databases in the cloud with ease.

Amazon RDS supports several popular database engines, such as:

1. MySQL
2. PostgreSQL
3. Oracle Database
4. Microsoft SQL Server
5. MariaDB
6. Amazon Aurora (a MySQL and PostgreSQL-compatible database engine developed by AWS)

With Amazon RDS, you don’t need to worry about database installation, patching, backups, or infrastructure management. Instead, AWS takes care of these tasks for you, allowing you to focus on your application and data.

Key features of Amazon RDS include:

1. Automated Backups: RDS automatically performs regular backups of your database, enabling you to restore to a specific point in time or recover from a disaster.

2. High Availability: RDS offers options for Multi-AZ deployments, which replicate your database across multiple availability zones to ensure high availability and data durability.

3. Scaling: You can easily scale your database instance up or down depending on the workload and performance requirements.

4. Security: Amazon RDS provides security features such as encryption at rest and in transit, network isolation, IAM-based authentication, and more.

5. Monitoring and Metrics: AWS offers various monitoring and logging capabilities, including Amazon CloudWatch, to track database performance and generate alerts when needed.

6. Maintenance: RDS automates routine database maintenance tasks like hardware and software updates, so you don’t have to perform them manually.