pgAdmin 4 is an open-source administration and management tool for PostgreSQL, one of the most popular open-source relational database management systems (RDBMS). It provides a web-based interface for managing and interacting with PostgreSQL databases. Here's a detailed description of pgAdmin 4:Web-Based Interface: pgAdmin 4 is a browser-based application, which means you can access and manage your PostgreSQL databases from a web browser on any platform, including Windows, macOS, and Linux. This makes it a platform-independent tool and provides flexibility for users.Cross-Platform: While the server-side component of pgAdmin 4 is designed to run on a variety of platforms, it's also available as a desktop application for Windows and macOS. This allows users to choose their preferred way of accessing the tool.