Okay kiddo, so the trident is not a big fork, but it's actually the name of the United Kingdom's nuclear weapons programme. It's a way for the UK to make sure it has very powerful weapons that could be used if ever needed.
So, imagine you have a toy gun that can shoot really far and strong. Now, imagine that the UK has a bunch of big toy guns that they keep very hidden so nobody tries to take them. These guns are actually so big that they could destroy entire cities! This is why the UK calls them "nuclear weapons", because they use a special type of energy that comes from tiny particles called atoms, to create a huge explosion.
Now, having these weapons is a big responsibility and there are a lot of rules and regulations that the UK government has to follow to make sure they are not using them in a bad way. They have to keep them very safe and make sure nobody who shouldn't have access to them can get their hands on them.
Some people think it's not a good idea for the UK to have these weapons, because they are very dangerous and could cause a lot of harm. But others think it's important to have them as a way of protecting the country if it were ever under attack. It's a very complicated topic, and people have different opinions about it, but that's the general idea behind the trident programme.