Brushless Drill (Milwaukee) Overview
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For the purposes of this article, there are basically 2 kinds of electric motors, "brushed" and "brushless". Brushed motors have been around for about 150 years, but vast improvements in the early 1900 have left them almost unchanged since then, and for what they are, they are an excellent, efficient motors.
With the invention of the transistors in the 1960s, motor development took another step forward with the invention of the brushless motors. It is only because of higher technologies that these motors can work in a high enough efficiency to make the commercially viable because instant internal switching needs to occur.
Milwaukee of course have taken some of the early steps in this field by producing a series of brushless drills, Impact Wrenches and Hammer Drills.
In Brushed motors, there are something called brushes that make contact with a specific part of the armature of the motor, the part that spins. In a brushless motor there are no brushes, the spinning is done by using permanent magnets and and switching poles internally in the motor in order to make it spin. Here is a great video from Learn Engineering that explains in detail how this works and compares it with brushed motor ....
Wood routers have been in use for the better part of 50 years, but for new woodworkers they still represent a bit of mystery. Part of the reason for this is that routers are capable of so many different kinds jobs and there is really no other tool that can replace the work they do. Another part of the confusion comes from the styles of wood routers which is either “fixed base” or “plunge” which always prompts the question, which is best?
Dremel was the original rotary tool, and when it came out in the market in 1932 it was quite revolutionary. Mr. A.J. Dremel was apparently quite the prolific inventor and it was easy to see all the applications that a tool like this could be and so began the marketing of the bits and accessories. 
Battery powered hand drills have become a mainstay to almost every aspect of working with wood. In building construction they are an important tool especially for carpenters, plumbers and electricians. For woodworkers who are almost always working in a shop and with electricity, battery powered tools are handy, but not always vital. I like the portability and how handy they are so even though I have a couple of corded drills, my cordless easily gets the bulk of drilling usage.
