3D printing is a process that creates three-dimensional solid objects from a digital file. It works by printing layers of material atop one another until an object is complete. Applications include industrial product prototyping and testing as well as personal uses like phone cases and toys. Advantages are rapid production, customization, and reduced costs, while disadvantages include limited materials, potential copyright issues, and high costs for printers. A survey found that people are interested in 3D printing but have concerns over costs and uses. The document concludes with a video on 3D food printing.