Linux log file location

Hi i am working in linux environment for the past 2.5 yrs.At first i worked in Redhat linux and later i started working in Ubuntu flavours.I have noticed almost all log files ar under /var/log directory (and subdirectory).

Just switch over to the directory /var/log:

cd /var/log
ls -la *.log

-rw-r----- 1 root   adm     409 2009-03-14 07:39 apport.log
-rw-r----- 1 syslog adm    4534 2009-03-14 10:56 auth.log
-rw-r--r-- 1 root   root  38607 2007-10-16 04:48 bootstrap.log
-rw-r----- 1 syslog adm   50222 2009-03-14 10:56 daemon.log
-rw-r----- 1 root   adm     505 2009-03-14 09:37 dpkg.log
-rw-r--r-- 1 root   root   3113 2007-10-16 05:00 fontconfig.log
-rw-r----- 1 syslog adm   81405 2009-03-14 10:56 kern.log
-rw-r----- 1 syslog adm       0 2007-10-16 04:48 lpr.log
-rw-r----- 1 syslog adm       0 2007-10-16 04:48 mail.log
-rw-r----- 1 mysql  adm       0 2009-03-14 06:38 mysql.log
-rw-r--r-- 1 root   root      0 2007-10-16 04:50 pycentral.log
-rw-r--r-- 1 root   root 116278 2009-03-14 06:52 scrollkeeper.log
-rw-r----- 1 syslog adm     116 2009-03-14 10:56 user.log
-rw-r--r-- 1 root   root    308 2007-10-16 05:00 wvdialconf.log
-rw-r--r-- 1 root   root  68794 2009-03-14 10:56 Xorg.0.log
-rw-r--r-- 1 root   root  46643 2008-11-22 23:14 Xorg.20.log
-rw-r--r-- 1 root   root   2080 2008-11-22 23:26 Xorg.21.log

In /var/log is the place where we can find all the linux log file such as authentication,kernel,cron,mail,Xorg,apache,system boot,mysql,user logs etc.