Looking for a plugin, not sure what to search for

[ Moved to the Fixing WordPress sub-forum. ]

At the end of my blog posts I usually repeat the same stuff. Then when I want to update that stuff I have to update it everywhere which is time consuming.

I heard there is a plugin that you can update in one place and it will update in all other places to save time.

Can anyone recommend the name of this plugin or some keywords to search for? Does this type of plugin go by a certain name?

Your help is appreciated.