Between the updates from a couple of years ago Clash of Clans, the night village or builder's base was included, a place that, like your main village, you will have to develop until it is impenetrable. Find out more about this game feature in this Mobailgamer post.
Builder base function
It's just a new village that you have to start from scratch and almost none of the rules of the main village apply, so it's like playing a side game.
Accumulate trophies in the Builder Base Clash of Clans it's done differently than in the normal village, because here, when we don't attack, we don't lose or gain trophies. You can only lose trophies or win them in each battle.
In short, it is a section of the game that aims to improve it and attract new audiences by combining aspects of the main village of Clash of Clans with dynamics of other titles of the company.