Texturizing Techniques
Q: What is cutting up, down, in and out, freehand, and channel cutting?
A: These are terms generally used in texturizing techniques for a stylist.
Freehand refers to the technique of snipping locks of hair without using fingers or a comb to isolate or direct them, while channel cutting (also sometimes called sliding) is using the shears (pointed along the length of the hair) to trim away small amounts of the hair and create very steep smooth layering. The effect is similar to razor cutting but is more targetted and results in a more textured look.
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See also:
Texturizing the hair
Razor cutting
What are club cutting, free hand and scissor over comb?
What is channel cutting?