MySQL process explanation

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http://serverfault.com – I have one MySQL process on my server running linux and it's always running it takes at least 50% usage of 1 Core (I have 8 cores)... This is process command: /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --log-error=/var/lib/mysql/server.mydomain.com.err --pid-file=/var/lib/mysql/server.mydomain.com.pid What this process is doing? This is not the issue just a question. (HowTos)