How do the four earthly appearances of Vishnu help the reader's understanding of dharma?

The four earthly appearances of Vishnu, known as avatars, illustrate the concept of dharma by demonstrating how divine intervention occurs to restore cosmic order and righteousness. Each avatar—Matsya, Kurma, Varaha, and Rama—addresses specific challenges faced by humanity, embodying the principle of duty and moral responsibility in diverse contexts. Through these narratives, readers gain insight into the importance of adhering to one's dharma in the face of adversity, highlighting the dynamic relationship between divine guidance and human action. This understanding reinforces the idea that fulfilling one's duty is essential for maintaining harmony in the world.