Please note that towards the end of this video, where I am showing different bias conditions, that the resistor connected from base to ground is actually 4.7kohms, not 2.7k as shown in the video. This is corrected in the show notes available below. This video gives the basics of the bias point, also called operating or quiescent point, of a bipolar transistor (BJT). For a BJT, there are three operating regions: Cutoff, Active and Saturation (note, these names differ a little when dealing with FETs). The Q-point will influence the "class of operation" of an amplifier circuit. Class A, B, C and AB are discussed and demonstrated. A copy of the video drawings can be found here:
http://www.qsl.net/w/w2aew//youtube/Bias_point_and_Class_of_operation.pdf