Big Data is defined as extremely large data sets that may be analyzed computationally to reveal patterns, trends, and associations, especially relating to human behavior and interactions.
In the simpliest way, the Internet of Things is everything connected and "talking" to each other. Each of our devices that we have all have their own unique signature or address. With this they gather information and then send it out into the world.
The reason why this is critical is that this means we are receiving and producing an unimaginable amount of data and information. From your toaster to your smart fridge, data is being gathered and sent off into the world.
This is relatabble to DTC because it is a driving point for many new technologies being released. From video games to new ways of interacting with the digital world(VR/AR), IoT is connected.