dbdiagram.io is a user-friendly tool designed for database modeling. Users can easily sketch out tables and relationships between them, generate SQL from their diagrams, and deploy schemas to databases such as PostgreSQL. The platform offers import/export capabilities for SQL and can generate images of your schema for sharing and reviewing purposes. Discussions among users highlight its simplicity, making it an attractive option as compared to more complex tools like DBeaver, which some users might question the necessity of.