Web Application Firewall (WAF)
Definition
A Web Application Firewall detects and blocks unwanted requests to web applications.
A security component that monitors HTTP traffic based on rules or models and can block or log unwanted requests.
Simply explained
It stands like a checkpoint in front of a website and examines incoming requests for suspicious patterns.
Why it matters in practice
The term contributes to secure, maintainable, and high-performance web applications as well as resilient technical decisions.
Example from business
A portal uses a WAF against known injection patterns and tests exceptions before activation.
Limits and pitfalls
- A WAF does not replace secure development, authentication, or patches; bypasses and false positives require maintenance.
Origin & history
WAFs were developed to protect web applications from known attack patterns and virtual patches.
Use in mid-sized companies
- Possible example: A portal uses a WAF against known injection patterns and tests exceptions before activation.
Frequently asked questions
What does Web Application Firewall (WAF) mean?
A security component that monitors HTTP traffic based on rules or models and can block or log unwanted requests. What should you watch out for? A WAF does not replace secure development, authentication, or patches; bypasses and false positives require maintenance.
Sources
- Web Application Firewall · OWASP, Web Application Firewall
Source checked on 10.10.2026. Editorial application examples are hypothetical; no evidence of real customer results.
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