A trellis is a supportive framework used to train and support climbing plants. Typically made from wood, metal, or plastic, it consists of a series of interwoven slats or wires that allow plants like vines, roses, and ivy to climb upward or across. Trellises are often used in gardens, patios, and outdoor spaces to create vertical greenery or provide structure for plant growth. They can be freestanding or attached to a wall or fence and come in various sizes, designs, and finishes to complement different landscapes.