What is an object group

Hello, when they speak of tiled ever hear of such an object group, what is it?

I think you mean the Object Layer. That basically is a collection of objects simply.

I just saw it in a tmx code of a site:

<objectgroup name="Collision" width="20" height="20">
<object x="287" y="354" width="127" height="60"/>

The objectgroup element in a TMX file is what is called “Object Layer” in the Tiled interface. I just considered “Object Layer” less confusing, but didn’t change the TMX format, to keep compatibility.

I’m sorry, did not know what it means, but I know the that is a layer of objects