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LOOKUP TABLES

I need to know about what a lookup table exactly is. I'm studying the 8051 uC, I am following the book "The 8051 Microcontroller, by I. Scott MacKenzie". There's nothing much mentioned about lookup tables, only a tiny one-paragraph section. It's not clear to me what a lookup table is and why is it required.

Basically I need to know the following:
•what a lookup table is
•how to create a lookup table
•accessing a lookup table
•how is it stored in memory

Help would be much appreciated. Thank you :)