What is the difference between a drill and an auger?

In the most technical sense, a drill is used to penetrate and create a hole, while an auger is used to move material along a path using a helical screw. The process of drilling with a helical bit involves aspects of both: the creation of the hole with the tip of the bit is drilling, while moving the waste material out of the hole along the helical path is augering. Not all drilling involves augering (oil field drilling uses a pump to move the material), and not all augering involves drilling (the auger in a harvester simply moves product to the bin). In practical use, when the helical vane of the drill bit is significantly wider than the drive shaft, people tend to call it an "auger" rather than a "drill", because the assembly looks less like a wood drill bit and more like a transfer auger.