Acharya Prashant explains that true friendship is defined by acting in another's interest to lead them toward the truth and auspiciousness. He contrasts this with the common, worldly definition of friendship, which often involves partnering in ignorance, protecting self-interests, and deepening illusions. He asserts that a real friend is one who helps strengthen the other's consciousness rather than merely pleasing their ego or body-centric identities. The speaker emphasizes that there is no real distinction between a guru and a true friend, as both should aim for the same goal of spiritual elevation.