Script & Plugin
Website plugins are individual services that extend the functionality of your site. You might use a website plugin to change visual elements, add extra information or content, and offer smoother integrations between your site and a favored tool. Plugins can also add a completely new function to your web property.
While Scripts are just like plugins in the sense that they are created with a programming language. However instead of customizing the software like a plugin does, a script automates a process or execution within the software.