Plugin

A plugin is an add-on module that extends existing software with new functions without you having to change the core code or program. Plugins are especially well known in WordPress ✕ WordPress is the world's most-used content management system, letting you build and manage websites and blogs without coding skills. More in the glossary → : with them you add, for example, an online shop, contact forms, SEO ✕ SEO (search engine optimization) covers all the measures that get a website to appear higher in Google's unpaid results and thereby attract more visitors. More in the glossary → tools, or security and backup features — usually with a few clicks. This makes a system extremely flexible. Important: every plugin should be kept up to date, since outdated plugins are a common security risk. Too many or poorly built plugins can also slow the site down. More in the best WordPress hosting comparison.