WAF fundamentals
WAF Fundamentals and Glossary
A vendor-neutral starting point for readers building a complete mental model of Web Application Firewalls.
Learning path
Understand the traffic path and control boundary first
Read the complete fundamentals guide, then move into cloud WAF, self-hosted WAF, open-source engines, product reviews, or deployment workflows according to the real requirement.
What is a Web Application Firewall?Start with the definition, purpose, and complete WAF decision model.How a WAF worksFollow parsing, policy evaluation, actions, evidence, and response flow.Types of WAFCompare managed edge, cloud-native, self-hosted, ingress, gateway, and embedded options.WAF vs firewall and other controlsSeparate WAF responsibilities from network firewalls, CDN, API gateways, and RASP.History and evolution of WAFTrace application proxies, ModSecurity, compliance, cloud WAF, WAAP, and modern platforms.WAF capabilities and limitsUnderstand where WAF helps and where code, identity, network, or architecture fixes are required.
Move into practice
Connect WAF concepts to products and validation
Similar feature names do not create the same architecture or operating model. Continue with traffic placement, ownership, cost, logging, and rollback as the decision criteria.
WAF vendor and product directoryBrowse structured deployment models, pricing paths, integrations, and official sources.Best open-source WAFSeparate complete products, inspection engines, and rule sets.Best cloud WAFCompare managed edge services and cloud-native resource attachment.Independent WAF reviewsReview deployment fit, limits, validation plans, and alternatives.WAF installation and validation guidesImplement an observe, tune, enforce, and rollback workflow.WAF labs and diagramsInspect original architecture diagrams, evidence, and reproducible methods.