A website firewall is a security tool designed to protect websites from online attacks and malicious traffic. It sits between the website server and the internet, inspecting incoming traffic and filtering out any suspicious or malicious requests before they reach the website.

A website firewall can protect against a variety of attacks, including:

1. Distributed Denial of Service (DDoS) attacks: These attacks overload the website with traffic, causing it to crash and become unavailable.
2. SQL injection attacks: These attacks exploit vulnerabilities in web applications to gain access to sensitive information or take control of the website.
3. Cross-Site Scripting (XSS) attacks: These attacks inject malicious code into web pages, potentially compromising the security of users accessing the website.
4. Malware infections: These attacks can infect the website with malware that can be used to steal data or launch further attacks.

5. A website firewall typically uses a combination of signature-based and behavioral-based analysis to identify and block malicious traffic. It can also provide real-time alerts and reporting on security events, allowing website owners to take action to prevent further attacks.

   Overall, a website firewall is an essential security tool for any website that wants to protect itself against online attacks and maintain the trust of its users.