Isinglass is a special kind of substance that comes from fish. Like the scales or the tails of the fish, isinglass is made up of tiny little pieces called collagen. Collagen helps keep the fish strong and healthy, and it can also help keep other things strong and healthy too!
In fact, people use isinglass to help make certain things strong and healthy. One of these things is beer. When people make beer, they mix different ingredients together, like water, yeast, and hops. But sometimes, the beer ends up being cloudy or hazy, which means you can't see through it very well. That's where isinglass comes in!
Brewers use isinglass to help clear up the beer and make it nice and clear. They add a little bit of isinglass, and it works kind of like a filter to catch all the little particles that are making the beer cloudy. Once the isinglass has grabbed onto all those particles, they all sink down to the bottom of the beer, and then the brewer can take them out.
So, in summary, isinglass is a special substance that comes from fish and is used to help make beer clear and easy to see through. It works like a filter, catching all the little bits and pieces in the beer that might make it look cloudy.