Glossary term
What is WAF (Web Application Firewall)?
WAF stands for Web Application Firewall.
In DevOps
Filters web requests before they reach your app, blocking common attacks such as SQL injection and abusive bots.
Learn it properly · DevOpsLesson 18: Security Hardening and BackupsLocking down what you built: patching, secrets, least privilege, automated backups and tested restores.In System Design
Filters malicious HTTP requests. Example: Blocking common SQL injection patterns at the edge.
Learn it properly · System DesignLesson 14: How CDNs Make the Web FastYour servers are in Mumbai and a user in São Paulo waits three seconds. How CDNs copy content to edges near every user, how HTTP headers control what gets cached, and how to update files that live on hundreds of servers.