Dynamic testing is essential because it uncovers vulnerabilities in running applications. But while SAST gets the attention because it’s shift-left and relatively straightforward to fix, DAST often gets stuck in the backlog. Application security testing generally splits into two approaches. SAST (static analysis) scans source code before it ever runs, catching issues while a developer is still in the file, which is why fixes tend to happen fast. You're editing code you just wrote, with full context on what it does and why. DAST (dynamic analysis) works differently. It tests an application while it's running, sending real requests at live endpoints to see what breaks, the same way an attacker would probe it from outside.