With regard to the difference between a wood drill bit and a metal drill bit, the respondent talks about a wood drill bit having a "spar/brad" and a "lip," but doesn't point to (or show such) in the accompanying photos!
As for how to tell them [wood bit vs. metal bit] apart -- wood drill bits have two distinguishing features: a spar (also brad) and a lip. The spar helps in keeping the bit centered when starting the hole and prevents wandering of the bit on the surface of the wood. The lip acts like a chisel, slicing through the wood fibers in the circumference of the drilled hole, improving the quality of the finish. This is most important for through holes, where the lips helps reduce "blow-out" of the wood when exiting the wood on the other side. Wood bits are typical black and silvery in color, but other colors exist.
Metal drill bits, on the other hand, have just an angle at the tip. They often are fully black (plain HSS), golden (often titanium oxide finish) or coppery (often cobalt steel) in color.
Could someone "point" to these distinguishing features?