Baking sheets, also known as baking trays or cookie sheets, are flat, rectangular metal pans used in ovens for baking a variety of foods. They are typically made from materials like aluminum or stainless steel and come in different sizes. The smooth surface allows for even heat distribution, making them ideal for baking cookies, pastries, and roasting vegetables. Many baking sheets have a non-stick coating, which helps prevent food from sticking and makes cleanup easier. Some sheets may also have raised edges, known as rims, to contain liquids or prevent food from sliding off. Using the right baking sheet can enhance your baking experience.