IAST
In plain terms
Security testing that analyzes apps from within while they run.
Going deeper
Interactive Application Security Testing instruments a running application to detect vulnerabilities with the context of real execution, blending static and dynamic insight. It finds issues during testing.
Under the hood
Lower false positives than SAST/DAST by observing actual code paths and data flow at runtime.
Examples
Runtime vulnerability detection, instrumented testing, CI security, app security.
Think of it like...
Like a building inspector walking through while the building is in use, seeing real problems in context.