Wordfence is a security plugin for WordPress and the most popular plugin of its type. We use it in almost all websites we build. It provides super awesome security functionality which includes:

• A web application firewall which blocks malicious traffic.
• A malware scanner which scans the WordPress files.
• Brute force login protection.
• Website repair tools.

Wordfence on its own is not enough to fully secure your website, but it’s a great start.

A basic install of Wordfence is free. Or you can choose to pay for the premium version which gives you extra protection and features.