What "planter box" means in gardening

A planter box is a container used for planting flowers, herbs, vegetables, or other plants. It is typically made of wood, metal, or concrete and is designed to provide a suitable environment for growing plants. Planter boxes are often used in urban areas where there is limited space for gardening, or where the soil is poor or contaminated. They can be placed on balconies, patios, or other outdoor spaces, and can be used to create a garden in any location. Planter boxes come in a variety of sizes, shapes, and styles, and can be customized to fit any gardening need.