A bhikkhu is like a special monk in Buddhism who has taken a lot of vows or promises to live a simple and humble life, and to follow the teachings of the Buddha. They wear robes and usually shave their heads. They live in temples with other monks and spend most of their time meditating, studying, and helping other people. They also usually don't have a lot of things, like fancy possessions or a lot of money, because they believe these things can distract them from focusing on spiritual growth. Overall, a bhikkhu is someone who dedicates their life to living in a more peaceful and mindful way.