Admin pages provide interfaces for plugin settings and management. Use add_menu_page() to create top-level menu items or add_submenu_page() for submenus. Implement proper capability checks to restrict access to admin users. Process form submissions with nonces and update_option(). Use get_option() to retrieve saved settings. Create clean, user-friendly interfaces that follow WordPress UI guidelines. Add help tabs for user guidance. Properly handle sanitization when saving options to prevent data corruption. Admin pages should provide clear feedback about successful operations. Consistent styling with WordPress admin ensures professional appearance.