Vasubandhu is widely regarded as one of the most important figures in the development of Yogachara Buddhism. Along with his half-brother Asanga, he is considered a co-founder of this branch of Buddhism, which emphasizes the practice of meditation and the understanding of the mind.

Vasubandhu's role in Yogachara Buddhism is multifaceted and encompasses both his contributions to the philosophical and practical aspects of the tradition. He is credited with writing several influential texts, including the Abhidharmakosha and the Vijnaptimatrata-siddhi, which are considered foundational texts in Yogachara thought.

One of Vasubandhu's key contributions to Yogachara philosophy is his concept of the Eight Consciousnesses. According to this model, there are eight levels of consciousness, with the first five corresponding to the senses and the sixth to the mind. The seventh consciousness is the storehouse of all past experiences and the eighth is the pure consciousness that is free from all mental defilements. This model helps practitioners understand the workings of the mind and how to cultivate a more enlightened state of consciousness.

In addition to his philosophical contributions, Vasubandhu also played a significant role in shaping the practical aspects of Yogachara Buddhism. He emphasized the importance of meditation and contemplation, as well as the cultivation of wisdom and compassion. He also developed various techniques and practices to help practitioners overcome obstacles and attain enlightenment.

Vasubandhu's teachings were instrumental in the spread of Yogachara Buddhism throughout Asia, particularly in China and Japan. His influence can be seen in the development of other Buddhist traditions, such as Zen and Pure Land Buddhism.

Furthermore, Vasubandhu's role in Yogachara Buddhism extends beyond his own teachings. He was also a prolific commentator and interpreter of Buddhist scriptures, and his works helped to clarify and expand upon the teachings of the Buddha. His writings continue to be studied and revered by practitioners of Yogachara Buddhism to this day.

In conclusion, Vasubandhu's role in Yogachara Buddhism is multifaceted and far-reaching. He was not only a co-founder of this important branch of Buddhism, but also a philosopher, teacher, and commentator whose contributions have had a lasting impact on the tradition. His teachings and insights continue to guide and inspire practitioners on the path towards enlightenment.