A WAF — a Web Application Firewall — sits between your visitors and your website, inspecting every request before it reaches your server. Think of it as a bouncer for your site: it recognises what SQL injection, cross-site scripting (XSS) and other common attacks look like, and blocks those requests before they can do any damage.
Most attacks on small websites are automated. Bots probe thousands of sites a day looking for known weaknesses — an outdated plugin, an unprotected login page, a form that accepts anything. A WAF stops the obvious junk at the door, which means far fewer malicious requests ever touch your code or your database.
Does every website need one? If your site has logins, takes payments, runs WordPress with plugins, or stores any user data, the answer is yes — a WAF is one of the cheapest layers of protection you can add. Many hosting providers and CDNs include a basic WAF for free, and cloud services offer managed rules you can switch on in minutes.
A WAF is not a replacement for the basics. Keep your software updated, use strong unique passwords, and scan your site regularly for vulnerabilities — a WAF buys you time, it does not fix the holes underneath. Find out what your site is actually exposed to with a free scan at https://vulnerabilitytools.com/ — then switch on the WAF rules that match your risks.
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