WordPress’ plugin architecture allows users to extend the features and functionality of a website or blog. WordPress has over 50,316 plugins available, each of which offers custom functions and features enabling users to tailor their sites to their specific needs.
These customizations range from search engine optimization, to client portals used to display private information to logged in users, to content management systems, to content displaying features, such as the addition of widgets and navigation bars. Not all available plugins are always abreast with the upgrades and as a result they may not function properly or may not function at all.
Most plugins are available through WordPress themselves, either via downloading them and installing the files manually via FTP or through the WordPress dashboard. However, many third parties offer plugins through their own websites, many of which are paid packages.
You can find the best and paid premium plugins here.