Differences between wpdb->get_results() and wpdb->query()

Who can explain me the differences between wpdb->get_results() and wpdb->query() in making generic queries to wordpress db?

The difference, if you want to call it that, is that the query() is the most generalized method to do queries with $wpdb, the get_results() method on the other hand is a specific method, which does make use of the query() method to retrieve the specific results of this method and then does some work on the output.