Some patterns will require you to join two separate crocheted pieces by whipstitching them together.

When the edges to be whipstitched are either the top or bottom of the pieces, use this method:
When the edges to be whipstitched are the sides of the pieces, the technique is the same except the rows are lined up and the needle is inserted in
the ends of rows instead of individual stitches:
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Hold the pieces so that the stitches from each piece line up
together.
 Using a yarn needle thread with yarn in a matching color
(contrasting color used in photo for demonstration purposes),
insert the needle from front to back through the first stitch of
both pieces.
   
Loosely tie a knot to hold the yarn in place.
 Insert the needle from front to back into the next stitch of
both pieces.
   
First whipstitch is complete.
 Continue in this way, inserting the needle from front to back
through each stitch across to the end.
   
Once the seam is complete, cut the yarn and thread it back
through the seam to hide the end.
 Whipstitch is complete.