Industry 4.0, also known as the 4th industrial revolution, makes reference to the inclusion of digitalization and interconnectivity tools inside factories, covering production processes to maintenance and training. Although the term has been around for some years now, in the last couple of years, this industry 4.0 concept has taken on a new dimension thanks to the exponential growth (in quality and quantity) of technologies such as Augmented Reality (AR) and Virtual Reality (VR), Internet of Things (IoT), Big Data Analytics (BDA), Additive Manufacturing (AM), Cyber-Physical Systems (CPS), and Artificial Intelligence (AI).

The visual component of AR makes it the natural interface for users who can receive real-time information about processes, access remote systems for extra data, and control processes and machines, all with a mobile device or smart glasses.

AR in manufacturing has many uses in areas such as prototyping, production, and training. In this chapter, we will cover prototyping and, more specifically, where AR can help reduce costs in prototyping by visualizing a design in the real world. This allows designers, workers, and potential customers to manipulate a model in its three dimensions, scale it, interact with individual parts, and even walk through them together. ARCore is one of the examples of an AR tool that we can use for that.