iTunes Tagging | File Names Options

[Curley]

Again, I'm sorry if this has been answered, or I am posting in the wrong section.
My apologies as I am new to this forum and my research abilities are rather poor.


So, here's the scenario.

-I'll download an entire album from an artist.
-The song files within the folder have poorly written information.
-After importing the song files into iTunes.
-I'll right click on the song, and select "Get Info".
-After doing that I will go to the "Info" tab and fill in what is required.

The only issue here, is that it only applies to the iTunes library.

For example if I were to drag out the song from my library in iTunes, into a folder for my friend to have...
Or I were to open the "My Music\iTunes\iTunes Media\Music" folder and look at the song files, they're still written with the original song information before I imported them into iTunes.

What I want to know, is how can I have the information that I write in the iTunes library apply to the file?