What the name of the thing that you put under the vase to protect the table from water spills?

The item you place under a vase to protect the table from water spills is called a coaster or a vase mat. Coasters are typically made of materials like cork, wood, or silicone and help absorb moisture, preventing damage to the surface below. Vase mats can also be specifically designed for larger vases and serve a similar protective function.