Editing Tags in itunes - does tag info stay with file?

Question

I have a question about editing tags in itunes, hopefully I can explain myself clearly enough here...
I have a very large music collection...almost 10,000 files now, and have spent alot of time editing the tags, renaming mispelled artists and song names etc...my question is, when that tag is edited, will all that tag info remain intact when I copy the actual mp3's to another computer? I want to back all the music up to my laptop, which is running same version of itunes, but I don't want to have to start over again with editing the tags. When I initially put the files on my computer the tags were really messed.
Thanks for any info.

Answer 1

Here is the last list I've had of attributes and were they reside:
For M4A and MP3 files... (WAV files do not have tags)
These are only in the iTunes Library files (ITL & XML):
-- Playlists
-- Ratings
-- Play Count
-- Last Played
-- Date Added
-- Date Modified
-- Equalizer
-- Volume Adjustment
These are stored in the music file itself:
-- Artist
-- Album
-- Song Title
-- Year
-- Comments
-- Compilation tag
-- Lyrics
-- Genre
-- Grouping
-- Volume Adjustment (a special iTunes only tag in the file - non-standard)
-- Composer
-- Bit Rate (not a tag - inherent to the file itself)
-- BPM
-- Kind (not a tag - inherent to the file itself)
-- Album Art (only stored in the file - not copied to the iTunes Library ITL or XML files)
Best of Luck