The Short Answer
Both treatments tackle light reflecting off the front of a screen, in different ways. Anti-glare breaks reflections up; anti-reflective removes most of them. On outdoor displays they are often used with optical bonding, which removes the reflections inside the screen.
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Anti-glare Etched or textured matte surface; scatters reflections; slightly softens the image; hides fingerprints.
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Anti-reflective Multi-layer optical coating; reduces reflected light; keeps contrast and sharpness; shows fingerprints more.
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Combined AG and AR can be combined on one cover glass for mixed lighting.
Which to Choose
For factory lighting and indoor kiosks, anti-glare is usually enough. For screens in direct sunlight, choose anti-reflective glass with a high-brightness panel and optical bonding. Our guide to optical bonding explains how the three work together.