1. Open Source: PostgreSQL is an open source database that is free to use and modify. This allows users to customize the database to their needs without having to pay for a commercial license.

2. Robust SQL Support: PostgreSQL’s SQL support is robust and allows for complex queries. It also supports a wide variety of data types including JSON, XML, arrays, and custom types.

3. High Performance: PostgreSQL is known for its high performance when dealing with large datasets. It is also able to handle high concurrency levels and can scale up to meet the demands of your application.

4. Security: PostgreSQL offers a variety of security features to keep your data safe. It includes authentication, authorization, encryption, and role-based access control.

5. Extensibility: PostgreSQL is highly extensible and can be customized with user-defined functions, stored procedures, and triggers. This allows developers to create custom solutions for their applications.

6. Cross-Platform Support: PostgreSQL can be used on a variety of operating systems including Linux, Windows, and MacOS. This allows developers to deploy their applications on multiple platforms.

Example:

You can use PostgreSQL to create a simple web application that stores user data in a secure and efficient manner. You can use the robust SQL support to query the data and the extensibility to add custom features. You can also use the security features to protect your user data. Finally, you can deploy the application on multiple platforms using PostgreSQL’s cross-platform support.

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