What is mysql.soc and where is it located

[suboh]

Hi,
 The following message appeared when I installed mysql server on Linux,,,

[2] 10804
[1]   Exit 1                  ./bin/mysqld -user-mysql
[mysql@localhost mysql]$ Starting mysqld daemon with databases from 
/var/lib/mysql
030701 19:59:18  mysqld ended

And also sometime the message can't find mysql.sock in 
/var/lib/mysql/mysql.sock despite that the installation directory and the 
daemon is in /usr/local/mysql/bin
I performed standard installation and also this message appeared if I install 
the MySql server as part of Redhat installed.
Thanks
Suboh