Okay, so you know how at church, there are special cups used to hold the wine and water that the priest uses during Mass? That cup is called an "altar cruet." It's a fancy-looking cup with a spout on the top to pour the liquids into the chalice. It's important because it allows the priest to have the wine and water ready for when he needs to use it during the Mass. Think of it like a special cup just for church to make it easier for the priest to do his job.