The Interface...
I would say an interface is the same as networking, where you two or more system can meet and interact. It thing is like connecting two systems, so that you can use one to reach another.
The first time I came to understand the concept behind an interface was during the leofinance zealy campaign, a new interface was introduced where you can post shorter content like twitter. It is called threading. Ofcourse, leofinance is a community in hive, and with their interface you can post on their blog and it would reflect on hive also. That is, one post, two blogs, and one interface connecting them both. It's a great work!
The more I see nice concepts like this, it keeps me thinking and I get excited into doing something more, something better. The interface something really works well...
You can also participate by clicking on this link:
https://hive.blog/hive-161155/@daily.prompt/mariannewests-freewrite-writing-prompt-day-2138-interface