大日如来佛祖，简称为大日如来，是一位至高无上的佛陀。祂的名字“大日”意为“大光明者”或“大太阳”，象征着祂是所有光明、智慧和真理的源泉，普照整个宇宙。与在特定历史时期证悟的佛陀（如历史上的释迦牟尼佛祖）不同，大日如来代表着法身，即“真理之身”或“实相之身”。这意味着祂并非一个具有物理形体的存在，而是终极实相、佛性普遍原则的体现。祂是所有其他佛陀的本源，被视为宇宙的本质，包容一切现象。修行者通过禅修，旨在证悟自身内在的大日如来佛性，从而理解他们与这宇宙真理本为一体。

Vairocana Buddha is a central and supreme Buddha; his name translates to "Great Illuminator" or "Great Sun," signifying his role as the source of all light, wisdom, and truth, illuminating the entire universe. Unlike Buddhas who have attained enlightenment in a specific historical period (like Siddhartha Gautama, the historical Buddha), Vairocana represents the Dharma-kaya, the "Truth Body" or "Body of Reality." This means he is not a being with a physical form but rather the embodiment of the ultimate reality, the universal principle of Buddhahood itself. He is the cosmic Buddha from whom all other Buddhas emanate, and he is seen as the very essence of the universe, encompassing all phenomena. Practitioners realise their inherent Mahavairocana nature through meditation, understanding that they are fundamentally one with this universal truth.