What does "optimize" mean?

[Jesse]

Seeing posts about mysqlcheck on the list prompted me to check out that 
utility.  A lot of it I can see is very useful, and I understand what it 
does.  However, what does the "optimize" command mean? What does it do? The 
help file says that the -o option optimizes, but what does that mean??   I 
ran it on one of my databases, and most of them said "OK", and some of them 
said "table is already up to date."  But I still have no idea what it did, 
if anything.

Thanks,
Jesse 


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