htaccess two begginer rules (I think) what they do

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http://www.linuxquestions.org – Hello, I have read apache manual but cant understand it quite well. For example I have this small cms php/mysql and it uses htaccess to make SEO frienly links. Code: RewriteCond %{REQUEST_FILENAME} -f RewriteRule ^(.*) $1 [L] RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*)$ index.php?category=$1 [L] I cant figure what it does. (HowTos)