Millions of people use web applications every day and connect to the Internet. The Internet and Web (home page) services have a direct impact on our daily lives and also our business work. Web applications have become a necessity for modern people, and the web where personal and sensitive information is concentrated, has become one of the most popular attack points for hackers. Hackers distribute malware through a web service accessibly, and achieve their purpose (leakage of internal information, ransom, spread of zombies, etc.) through the infected user PC. While attacks on the Web are becoming more intelligent, the management of Web services is still below expectations. Web applications that are essential to our lives, how long should we use them in this dangerous environment? Assuming that there is a home called a web application, shouldn’t it be protected from outside attacks that did not expect? Web firewalls act as a fence that protects against unexpected internal risks. Web firewalls also protect critical data and information that is concentrated on the Web and outweigh the limitations of traditional security devices such as traditional firewalls and IPS. So what exactly is a web firewall? Unlike traditional firewalls, Web Application Firewall (WAF) is a core solution for web application security. Detecting and blocking web attacks such as SQL Injection and Cross-Site Scripting (XSS) is the primary role of the web firewall. Web firewalls inspect suspicious web traffic and catch malicious web traffic before other security appliances can reach a real web server. It then automatically filters illegal traffic. Web application firewalls are also used as stand-alone hardware devices and are often used as cloud / software-based solutions. AIONCLOUD, a cloud-based WAF service that protects your website very easily and simply!