Let me explain the nature and the usage of plugins in general.
Plugins are programs that can easily be installed and used as part of your Web browser. It’s a piece of software that contains a group of functions that can be added to a WordPress website. By the help of plugins you can extend functionality or add new features to your WordPress websites. Plugins make it easy for the users to add many different and useful features to your websites. You can install/uninstall plugins from the admin area if you’re an administrator. Or you can download and manually install them using an FTP client.
Plugins may be Free and Pro.
Free plugins usually provide no support in case you have some issues concerning the usage of a current plugin. The Pro version plugins have a great advantage in this case, their developer teams are usually very supportive and most of them do their best to solve any problem you got with the plugin and help you understand the rules and give you detailed instructions to use the plugin. Some say that WordPress plugins affect on the speed of your pages’ work, but that’s not true! That may happen only if the plugin you use is a bad quality one. In this case only thing you should do is to uninstall the plugin affecting on your website and find a better one!
Hope you liked this article, guys!