The Application Security Readiness Checklist is a comprehensive list of tasks to help ensure an application is secure. It covers areas such as authentication, authorization, encryption, secure coding practices, patching, and logging. It also includes recommendations on using secure development frameworks, code reviews, testing, and configuring firewalls. The checklist is designed to help guide developers and system administrators through the process of hardening an application and making sure it is secure. Additionally, the checklist helps identify potential security issues and provides guidance on how to best address them.