A database viewer acts as the bridge between you and your raw data. While a Database Management System (DBMS) like PostgreSQL or MySQL handles the actual storage, the "viewer" or "client" is the tool you download to see that storage in a human-readable format. Key benefits of downloading a modern viewer include:
View records in a spreadsheet-like grid instead of raw text.
Automatically generate Entity-Relationship Diagrams (ERDs) to understand how different tables link together.