Arhat (Sanskrit: अर्हत arhat; Pali: arahant), in Buddhism, signifies a spiritual practitioner who has realized certain high stages of attainment. The implications of the term vary based on the respective schools and traditions.

The exact interpretation and etymology of words such as arahant and arhat remains disputed. In the Theravada tradition, and in early PTS publications, the word arahant or arhat is interpreted to mean the "worthy one" This has been challenged by more recent research, resulting from the etymological comparison of Pali and early Jain Prakrit forms (arihanta and arahanta). The alternative etymology is "foe-destroyer" or "vanquisher of enemies," which corresponds to the Jain definition. The latter challenges the assumption that the root of the word is Pali araha (cf. Sk. arha); Richard Gombrich has proposed an etymology of ari + hanta, bringing the root meaning closer to Jina (an epithet commonly used of both the leaders of the Jain religion and Buddha).

The term arhat was translated into East Asian languages phonetically as a transliterated term, exemplified in the Chinese āluóhàn (Ch. 阿羅漢), often shortened to simply luóhàn (Ch. 羅漢). However, the Tibetan term for arhat was translated by meaning from Sanskrit. This translation, dgra bcom pa, means "one who has destroyed the foes of afflictions." This Tibetan translation of the meaning conforms with the Jain definition as well.

Buddhism is a religion and philosophy indigenous to the Indian subcontinent and encompasses a variety of traditions, beliefs, and practices largely based on teachings attributed to Siddhartha Gautama, who is commonly known as the Buddha (meaning "the awakened one" in Sanskrit and Pāli). The Buddha lived and taught in the eastern part of Indian subcontinent some time between the 6th and 4th centuries BCE. He is recognized by Buddhists as an awakened or enlightened teacher who shared his insights to help sentient beings end ignorance (avidyā), craving (taṇhā), and suffering (dukkha), by recognizing dependent origination and sunyata, and attain Nirvana.

Two major branches of Buddhism are recognized: Theravada ("The School of the Elders") and Mahayana ("The Great Vehicle"). Theravada has a widespread following in Sri Lanka and Southeast Asia. Mahayana is found throughout East Asia and includes the traditions of Pure Land, Zen, Nichiren Buddhism, Tibetan Buddhism, Shingon, Tiantai (Tendai) and Shinnyo-en. In some classifications, Vajrayana—practiced mainly in Tibet and Mongolia, and adjacent parts of China and Russia—is recognized as a third branch, while others classify it as a part of Mahayana. There are other categorisations of these three Vehicles or Yanas.

Piya Tan Beng Sin (Chinese: 陈明信; born 20 August 1949 in Malacca, Malaysia), also known as Piya Tan or Piyasilo (monastic name), is a Peranakan full-time lay Buddhist writer-cum-teacher in Singapore. He actively teaches the Buddha's Dharma, meditation and Pali to various Buddhist groups and organisations, and also works as a meditation therapist and counsellor at The Minding Centre (TMC). He is the first full-time lay Dharma worker ("Dharmacari") in Singapore to be supported by donations from the Buddhist community.

As a youth, Piya was a self-confessed bookworm who loved the great outdoors, especially climbing Gunung Ledang in Malaysia. On one such trip, while running after a butterfly to net it, he serendipitously stopped right at the edge of a cliff. During this near-death experience, the thought flashed across his mind that there are better things than catching butterflies. This was one of the major factors that led him to later become a monk. In his layman years before ordination, while Principal of the Seck Kia Eenh Dharma School (Malacca Buddhist Association), Malaysia, he prepared and implemented the Integrated Syllabus of Buddhist Studies, the most comprehensive Buddhist syllabus in Malaysia and Singapore then. As a monk, Piyasilo was best known for his national Dharma courses in Malaysia and Singapore and served as advisor or consultant to various tertiary Buddhist societies and Buddhist groups.