What is the difference between laser cutting and water cutting in sheet metal?

The difference between laser cutting and water cutting in sheet metal is that laser cutting uses a laser beam that heats the material and divides it, resulting in an even, fine cut. Water jet cutting uses a water jet with a mixture of sand, which under very high pressure divides the material and results in a slightly more uneven cut surface. Waterjet cutting can also cut combustible and porous materials.