Shift Left
In plain terms
Moving testing and security earlier in development.
Going deeper
Shift-left integrates quality and security checks early in the lifecycle rather than at the end, catching issues when they're cheap to fix. Earlier feedback reduces cost.
Under the hood
Embeds testing, security scanning, and review into development; central to DevSecOps.
Examples
Early SAST, unit tests in dev, security in CI, pre-commit checks.
Think of it like...
Like proofreading as you write rather than after the book is printed.