Catch, Server Connect?

Lets assume I have been buffering for a few years…

I’ve been using DMX extensions for some years now, and have adopted Wappler as my replacement for both DW and my DMX Subscription, but I still do not quite know what Catch is used for in Server Connect?

Please can one of the fine members of this community, or the outstanding team at Wappler, explain this to me?

Much appreciated!