A WAF (web application firewall) sits in front of a website and blocks common attacks such as SQL injection, password guessing and malicious bots. It does not replace updates, but it reduces risk considerably.
A WAF can run on the server or as an external service. Its rules are tuned so that regular visitors and search engine crawlers are not affected.
A WAF is usually combined with two-factor sign-in for the admin area, login attempt limits and monitoring.
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