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What is the relation of nice and priority in Linux?

Hello, I would to understand the relationship of nice and priority in Linux, as per my current knowledge the nice value range is 19 to -20, where -20 is the highest number to set for high priority CPU scheduling. Could someone please explain me how is the priority number is affected by the nice value? Thanks!
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beer9
Asked:
beer9
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_3mp3ror_Commented:
The nice command allows programs to be started at a lower or higher than normal scheduling priority.
This allows you to control which processes the kernel should favor when dividing processor time among running programs.
Processes with the lowest nice number are executed with the highest priority and vice versa.

On most systems, priority levels for normal users range from 0 to 19, with 0 being the highest priority and 19 being the lowest priority. The root user can create processes with a range of -20 (highest) to 19 (lowest).
Most programs start with a nice level of 0 by default. Critical system services usually have a negative nice level so that they are always given preference over user programs.

This quote  is from a realy good book which is free btw. If you are new to linux commands I highly recommend it.
http://dontfearthecommandline.blogspot.com/
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