@dfreniche
In the Debian tutorial is clear: everything ending in d is a Daemon.
Well, the tutorial is wrong there. There can easily be commands that end with d, and are not daemons. For example:
chmod
dd
ed
lsmod
mkmod
pwd
sed
depmod
insmod
parted
rmmod
cdrecord
find
head
hostid
id
ld
mkpasswd
passwd
groupadd
groupmod
useradd
usermod
So it should say "Note some of the commands ending in d ...", or so.