This is a SOIC narrow breakout board for 16 pin and lower pin count parts. This board breaks the pins of the SOIC package out to 0.100" (100 mil) header pins. As shown in the pictures below and described in the video, these boards allow you to breadboard circuits. This is important because it allows users to get a functional circuit up and running with the bugs worked out before they order expensive circuit boards.
Length = 0.930"
Width = 0.630"
Up close shot of an empty breakout board:
Breakout board built up with headers and an IC:
End result, Breakout board in circuit: