The admin functionality within the application is designed to efficiently manipulate the database. Administrators can perform CRUD (Create, Read, Update, Delete) operations on various entities like brands, products, and categories through a user-friendly interface. This includes adding new products or brands, updating existing records, and deleting items that are not linked to dependent records. The use of Sequelize ensures that these operations are executed with integrity, maintaining consistent relationships between different models in the database. Additionally, features like search and filtering enable admins to manage large datasets effectively, further enhancing the application's administrative capabilities.