A poster board is a thick, sturdy sheet of paper or cardboard used for displaying information, artwork, or projects. It typically comes in various sizes, with the most common being 22 x 28 inches. Poster boards are often used in schools for presentations, science fairs, and art projects, allowing students to showcase their work in a visually appealing way. These boards can be found in a variety of colors and finishes, making them versatile for different themes and purposes. They are commonly used in settings like classrooms, offices, and events to convey messages or promote products, similar to how banners and signs are utilized.