Imagine that you have a glass of juice and you add a lot of sugar to it. It tastes really sweet now, right? Well, liqueur is kind of like adult juice that has lots of sugar and alcohol in it.
Liqueurs are usually made from a base spirit (like vodka, brandy, or whiskey) and then lots of sweet stuff is added, like sugar, fruit, herbs, and spices. This makes them taste really yummy and different from regular alcohol. They come in lots of different flavors too, like chocolate, coffee, vanilla, and even flowers like lavender.
You usually drink liqueurs after dinner, because they're like a dessert in a glass. They can be sipped on their own, mixed into cocktails, or poured over ice cream or cake for an extra special treat.
But remember, even though liqueur tastes like candy, it still has a lot of alcohol in it, so it's important to drink it responsibly and only when you're grown up.