Noob question about import/export...

If I have my movies on a unraid server in seperate folders like this:

/movies
/Pulp Fiction
Pulp fiction.mkv
Pulp fiction.nfo
Pulp fiction.tbn
/Raiders of the lost ark
Raiders of the lost ark.mkv
Raiders of the lost ark.nfo
Raiders of the lost ark.tbn


Does the export function save the .nfo and .tbn files? If I read it correctly it saves an xml file (which I don't understand what that is). I am lost as to what it physically saves? Meaning...if I were to have the movies saved somewhere I don't need to also save the plot/outline, movies posters, background art,etc...

Hee hee...so what does "export" actually do in "NOOB" language please. Thank you