Glass etching is a decorative technique that involves creating designs on glass surfaces by using an abrasive substance or acid. This process can produce intricate patterns, images, or text, making it popular for personalizing items like glassware, mirrors, and windows. The etching process typically starts with applying a stencil or resist material to the glass. Once the design is in place, the glass is either sandblasted or treated with an acid solution to remove the surface layer, revealing the etched design. This technique can be used for both artistic and functional purposes.