Lead-in / Lead-out?

What is lead-in and lead-out? At the beginning of burning an audio CD in Nero the status says "burn-in". At the end of burning the disc the status says "lead-out".
 
lead in is the table of contents of the disc

it tells the reader what format the disc is in, and where all the files are located

the lead out is just blank, and was really created for audio cd-players, so that if you were fast-forwarding through a disc at a fast speed, and got to the end, but the disc failed to stop immediately, it wouldn't damage the player

it's basically just a 3:00 track of nothing but "stop playing!" messages

if you're writing a data disc, you can do without the lead out, so you can actually "overburn" a disc and write extra data (around 30 MB) where the lead out should be.
 
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