A mat that is typically cut from a heavy cardboard. Matboard serves two very important functions in the overall framing of a picture. First and foremost it protects the artwork and second it showcases and enhances the subject being framed. It is important to protect works of art on paper, photographs, and other framed objects from direct contact with glass. Matboard provides a barrier from the airborne pollutants, moisture, acids and other damaging impurities that can impact the life of the framed piece. Matboard when used correctly also leads your eye into the artwork, enhancing the overall effect. Whenever a work's presentation or storage environment should be of archival quality, be sure to use acid-free matboard. It is more expensive, but is much less likely to discolor artworks over time.