A Brahmin is a member of an upper caste within Hindu society.

The six duties of a Brahmin are given as per the Sloka
Adhyaapanam Adhyayanam
Yajanam Yaajanam Tathaa
Daanam Pratigraham Chaiva

Teaching, learning, performing Yaaga, make performing Yaga, accept Daana, and give Daana are the six duties of a Brahmin.

The history of the Brahmin community in India begins with the Vedic religion in ancient India. The Manu Smriti, an ancient Smriti, refers to Aryavarta as the land of Vedic people. The Vedas are the primary source of knowledge for brahmin practices. All the sampradayas of Brahmins take inspiration from the Vedas. Traditionally, it is believed that Vedas are apauruṣeya (not written by either humans or God) and an?di (beginingless), but are revealed truths of eternal validity. The Vedas are considered Śruti (that which is heard, signifying the oral tradition).

Due to the diversity in religious and cultural traditions and practices, and the Vedic schools which they belong to, Brahmins are further divided into various subcastes. During the sutra period, roughly between 1000 BCE to 200 BCE, Brahmins became divided into various Shakhas (branches), based on the adoption of different Vedas and different rescension Vedas. Sects for different denominations of the same branch of the Vedas were formed, under the leadership of distinguished teachers among Brahmins. The teachings of these distinguished rishis are called sūtras. Every Veda has its own sūtra. The sūtras that deal with social, moral and legal precepts are called Dharma Sutras, whereas those sūtras that deal with ceremonials are called Shrauta Sutras and domestic rituals are called Grhya Sutras. Sūtras are generally written in prose or in mixed prose and verse.

There are several Brahmin law givers such as Angirasa, Apasthambha, Atri, Brihaspati, Boudhayana, Daksha, Gautam, Harita, Katyayana, Likhita, Manu, Parasara, Samvarta, Shankha, Shatatapa, Ushanasa, Vashishta, Vishnu, Vyasa, Yajnavalkya and Yama. These twenty-one rishis were the propounders of Smritis. The oldest among these smritis are Apastamba, Baudhayana, Gautama, and Vasishta Sutras.
Brahmin community was divided into two groups: srotriya (learned in vedas and rituals) and non-srotriya, reports Chanakya in his Arthasastra, in 4th century BCE. During that period the society was clearly divided into two groups, Aryas further consisting of four varnas and non-Aryas further having innumerable castes, reports Chanakya or Kautilya.

Brahmin castes in the Indian subcontinent are also divided into two regional groups: Pancha-Gauda Brahmins and Pancha-Dravida Brahmins. This classification occurs in Rajatarangini of Kalhana. In Andhra Pradesh, Brahmins are broadly classified into 2 groups: Vaidika (educated in vedas, performing religious and secular vocations) and Niyogi (performing only secular vocation), which are further divided into several sub-castes.

Brahmins adhere to the principles of Hinduism, such as acceptance of the Vedas with reverence, adherence to the position that the means or ways to salvation and realization of the ultimate truth are diverse, that God is one, but has innumerable names and forms to chant and worship due to our varied perceptions, cultures and languages. Brahmins believe in Sarvejan?ssukhinobhavaṃtu — Let the entire society be happy and prosperous and Vasudhaiva kuṭuṃbakaṃ — the whole world is one family. Most Brahmins practice vegetarianism (Bengali Brahmins and Kashmiri Pandits and also Goud Saraswat Brahmins are exceptions to this).

Brahmin world link———->http://www.brahminworld.com/bw1.htm

Brahmin Wikipedia link——>http://en.wikipedia.org/wiki/Brahmin