A priest or priestess is a religious leader authorized to perform the sacred rituals of a religion, especially as a mediatory agent between humans and one or more deities. They also have the authority or power to administer religious rites; in particular, rites of sacrifice to, and propitiation of, a deity or deities. Their office or position is the priesthood, a term which also may apply to such persons collectively.
According to the trifunctional hypothesis of prehistoric Proto-Indo-European society, priests have existed since the earliest of times and in the simplest societies, most likely as a result of agricultural surplus and consequent social stratification.
In many religions, being a priest or priestess is a full-time position, ruling out any other career. Many Christian priests and pastors choose or are mandated to dedicate themselves to their churches and receive their living directly from their churches.
They are generally regarded as having privileged contact with the deity or deities of the religion to which they subscribe, often interpreting the meaning of events and performing the rituals of the religion. There is no common definition of the duties of priesthood between faiths; but generally it includes mediating the relationship between one’s congregation, worshippers, and other members of the religious body, and its deity or deities, and administering religious rituals and rites.
Worship is an act of religious devotion usually directed towards a deity. An act of worship may be performed individually, in an informal or formal group, or by a designated leader. Such acts may involve honoring.
Worship in Buddhism may take innumerable forms given the doctrine of skillful means. Worship is evident in Buddhism in such forms as: guru yoga, mandala, thanka, yantra yoga, the discipline of the fighting monks of Shaolin, panchamrita, mantra recitation, tea ceremony, ganacakra, amongst others.
Buddhist Devotion is an important part of the practice of most Buddhists. According to a spokesman of the Sasana Council of Burma, devotion to Buddhist spiritual practices inspires devotion to the Triple Gem. Most Buddhists use ritual in pursuit of their spiritual aspirations. In Buddhism, puja (Sanskrit & Pali: pūjā) are expressions of “honour, worship and devotional attention.
Source : Wiki