Web Application Firewalls (WAFs) are vital in safeguarding web applications by inspecting and managing HTTP traffic between the application and the Internet, adhering to the principles of the CIA (Confidentiality, Integrity, Availability) triangle. This paper explores the function of WAFs in enhancing security through strict traffic filtering based on pre-defined rules. It also highlights the importance of balancing application security and performance to prevent potential slowdowns due to extensive security checks. The paper’s topic extends to the potential consequences of imprecise rules, which could block legitimate requests, reducing user satisfaction and possible loss of clientele.