# Chapter 2: The Evolution of Application Security Software security as we all know it today didn't always are present as an official practice. In typically the early decades associated with computing, security problems centered more about physical access in addition to mainframe timesharing handles than on code vulnerabilities. To understand contemporary application security, it's helpful to trace its evolution through the earliest software problems to the advanced threats of today. This historical journey shows how every era's challenges formed the defenses and even best practices we now c