Wordpress is one of the most used CMS on the internet, and because of this, one of the most targeted systems by bots and hackers.
A brute-force attack consists of systematically checking all possible keys or passwords until the correct one is found. WP Login Delay is a small plugin that offers a simple help against this.
For each login attempt on the system, the plugin will add a delay of one second. Although the users will not feel any difference when logging into the system, this can help again a bot that is sending thousands of requests and waits for their results.
*This plugin will not make your system highly secure, there are other security plugins that do the job better than WP Login Delay.* But installing this plugin will add one more defense to your website, and this defense should not conflict with any other defense already installed.