Which type of glass shatters into small pieces that do not have sharp edges?

Tempered glass is designed through a process of extreme heating and rapid cooling, which strengthens its structure. When tempered glass shatters, it breaks into small, blunt pieces rather than sharp shards. This characteristic significantly reduces the risk of injury, making it a safer option in environments where the potential for breakage exists, such as in vehicles, shower doors, and other applications.

In contrast, ordinary window glass typically breaks into large, jagged pieces, which can be hazardous. Laminated glass, while it holds together when shattered due to a layer of plastic sandwiched between layers of glass, does not necessarily shatter into small pieces. Wired glass has steel wire embedded within it and also tends to break in a manner that can produce sharp edges. Therefore, the unique safety feature of tempered glass makes it the correct answer in this context.