Which philosophical system does De rerum natura explain?

De rerum natura (On the Nature of Things) explains the philosophical system of Epicureanism, founded by the Greek philosopher Epicurus.12

The poem serves as the most complete surviving exposition of Epicurean physical theory, which is rooted in atomism. In addition to these physical doctrines, the work also addresses the ethical and logical tenets of the school. Through his writing, Lucretius aimed to provide a comprehensive account of the universe, arguing that all things are composed of moving atoms and void, and that humans should seek to maximize pleasure and minimize pain by overcoming irrational fears of death and the gods.23