Here ya go Bob, let me add this. Knots are a very important part of fishing. As you get old and your eyes go bad it becomes much more challenging and frustrating in the wind and dark.
http://www.animatedknots.com/uniknot/index.php?LogoImage=LogoGrog.jpg&Website=www.animatedknots.com
Uses: The Uni Knot is a versatile knot which can be adapted to many purposes including snelling; connecting hooks, swivels and lures with a loop; and joining two lines.
Advantages: It is fairly easy to tie in the dark with practice.
Claims that it retains a high proportion of line strength have been disputed. When tied round a large diameter eye, it may retain strength well, but if used to join two lines, like other knots where a line passes round itself, a breaking strain of 50% of ideal performance is more likely.