When running ls -l, why does the filesize on a directory not match the output of du?

Question

What does 4096 mean in output of ls -l?

[root@file nutch-0.9]# du -csh resume.new/
2.3G    resume.new/
[root@file nutch-0.9]# ls -l 
total 55132
drw         


        

Answer 1

That the directory takes up 4096 bytes of disk space (not including its contents).