The caste system is a classification of people into four hierarchically ranked castes called varnas. They are classified according to occupation and determine access to wealth, power, and privilege.
The Brahmans, usually priests and scholars, are at the top. Next are the Kshatriyas, or political rulers and soldiers. They are followed by the Vaishyas, or merchants, and the fourth are the Shudras, who are usually laborers, peasants, artisans, and servants. At the very bottom are those considered the untouchables. These individuals perform occupations that are considered unclean and polluting, such as scavenging and skinning dead animals and are considered outcastes. They are not considered to be included in the ranked castes.
The four orders of society are believed to have originated from the self-sacrifice of Purusha-the creator, the primeval being and are mentioned in Rig Veda.
There seems to be a constant upward and downward social mobility between the different Varnas.When a lower Varna changed into a higher varna, it was known as jatyutkarsa or uplift of the caste. On the other hand, if a person belonging to a higher varna gradually descended into a lower Varna, it was known as jatyapakarsa or the degeneration of the caste. While the caste system is rigid without possibility of social mobility.
Caste on the other hand may be defined as a hereditary endogenous group which decides the individual‟s status in the social stratification and his profession. Caste is also defined as an aggregate of persons whose share of obligations and privileges is fixed by birth, sanctioned and supported by magic and or religion.
Caste is basically a closed system of stratification, since members are recruited on the criteria of ascribed status. In other words, an individual becomes a member of a caste in which he or she is born. Thus it is an ascribed status. Even if there is social mobility in the caste system through the process of Sankritisation, urbanizations, etc it is only a positional change rather than a structural change.
The main features of caste system in Indian Society are –
(1) Hierarchy
(2) Endogamy and Hypergamy
(3) Pre-fixed occupation of castes
(4) Restriction on food, drink, smoking etc.
(5) Distinction in customs, dress and speech
(6) Differentiation in rituals
(7) Caste based disabilities
(8) Theory of pollution
(9) Criteria of touchability and untouchability
(10) Concept of purity and impurity
(11) Claim of Divine creation
(12) Prohibition on marriages outside one‟s own caste
(13) Location or residences.
The division of Indian society into various castes, together with the practice of untouchability, and the geographic isolation of some tribal communities has meant that these communities have lagged behind others in terms of educational and occupational attainment, political participation and with regard to opportunities for social mobility.
There were many movements and governmental actions that took place pre- and post- independence in order to overcome and attempt to eliminate the inequalities and injustices associated with the caste system. During 
the national movement, Gandhi began using the term “Harijans” (God‟s people) to refer to the untouchables in order to encourage a shift towards positive attitude towards the lower castes. B.R. Ambedkar campaigned for greater rights for Dalits in British India, and even after independence.
Theory of Sankritization and Mordernization has lead to the diminishing characteristic of caste system in Indian society.
Four broad classification of ‘Prajaati’ (different groups of Jaati) as envisaged by Rishis are Udbhija,Andaja, Pindaja and Ushmaja.
- Udbhija: are the Jaati or group that are coming out of ground like plants, crops etc.
- Andaja: Jaati or group takes birth from eggs, like birds, reptiles etc.
- Pindaja: Jaati or group are those which are born from womb or say mammals.
- Ushmaja: are those Jaati or group that are reproduced due to temperature and ambient condition like bacteria, virus etc.
- This Prajati (Jaati group) is further classified as jaati based on similar physical characteristic of a Jaati. This is the Jaati created by God (or nature) and can’t cross breed across the Jaati. Now on mammals there are many varieties of Jaati like tiger, dog, cat, human etc. All forms a special Jaati.
- Thus human belongs to one jaati that’s called manav Jaati (or human race). Thus jaati is immobile but doesn’t divide humans! Forget about Indian population, in fact humans of the World in fact belongs to one Jaati. That’s why Vedas say ‘Vasudhyava Kutumbakam’.
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