Moving MySQL, Backing up MySQL ??

In ways these are the same question. I have a standard SuSE Pro 9.1 installation. Where are the database files for MySQL? I want to back up only the db and relavent config files not any of the MySQL binaries. Also which files (the db files) do I move to migrate the entire database to a MySQL (same version) running under a different Linux distro (Red Hat)? Thanks in advance john