Which is the Default Template file for collections in liquid?

[Aliasgar]

I want to create a new collection template so that I can distinguish the layout a little from my other collection pages. So far all my collection pages are using the default template. I want to create a new template in liquid and want to know how I can tell edit the file to make it use the new template that I will be creating. 

Which liquid files am I supposed to duplicate to achieve this? And what are the settings that I need to configure to achieve this? 

I'm using debut theme for my store.