Physics is defined as the study of the fundamental principles governing the universe, focusing on understanding natural phenomena and their underlying mechanisms. The discussion emphasizes that physics involves a continuous quest for knowledge, akin to an adventure of inquiry into the workings of nature. A notable reference is made to Einstein's characterization of physics as the human mind's effort to align its understanding with reality. The conversation touches on the philosophical implications of physics, hinting at a connection to existential questions, which leads to a moderator's intervention to prevent religious claims from dominating the discussion.