Browser: shows user visiting pages (/library, /profile, /all-books) and submitting forms (/add-book, /add-review). Flask App: boxes for routes and functions (library(), profile(), all_books(), add_book(), add_review()), showing request handling and form validation. Database: MySQL tables (Book, Author, Genre, User, Review), connection, and cursor operations. Templates: library.html, profile.html, all_books.html showing dynamic rendering. Flash messages: success/error messages displayed after actions. Use arrows to show data flow between Browser, Flask, Database, and Templates. Use different colors for Browser, Flask, Database, and Templates. Make it visually clear, organized, and professional, suitable as a study diagram." Mehr sehen