Ping… website to update Search engines

I am drawing a total blank here. I know that every so often, especially after adding pages, there is website that you are supposed to visit, with the name ping somewhere in the URL, that updates your content.

I am also thinking that there might be a setting on a plugin, such as All-in-one that does this automatically. I have searched the All-in-one and am still looking for this.

If anyone knows what I am talking about, I would appreciate the input.

Have a good holiday.