Sanskritization, a concept coined by sociologist M.N. Srinivas, describes a process of social mobility in India where a 'low' caste, tribe, or other group changes its customs, rituals, ideology, and way of life in the direction of a 'high' and frequently 'twice-born' caste. It is a process of cultural imitation aimed at achieving a higher social status within the caste hierarchy.

Key Features and Illustrations:

1. Imitation of Upper Caste Practices: Lower castes adopt practices associated with upper castes, such as vegetarianism, abstaining from alcohol, performing specific rituals, wearing sacred threads, and adopting upper-caste names or surnames. For instance, many lower caste groups have given up meat-eating and alcohol consumption to emulate Brahminical purity norms, hoping to be perceived as 'cleaner' and thus higher in status.
2. Positional Change, Not Structural: Srinivas emphasized that Sanskritization leads to a 'positional change' for a group within the caste system, but it does not alter the fundamental structure of the caste system itself. The hierarchy remains intact; only the position of a particular group within it might shift over generations. For example, a particular 'Shudra' caste might successfully Sanskritize and be recognized as a 'Vaishya' or even 'Kshatriya' over time, but the categories of Shudra, Vaishya, and Kshatriya persist.
3. Dominant Caste as Reference Group: The reference group for Sanskritization is often the locally dominant caste, which may not always be Brahmin. In some regions, a powerful Kshatriya or Vaishya caste might serve as the model for emulation. For instance, in parts of South India, the Lingayats or Vokkaligas, though not Brahmins, have been dominant castes whose practices were emulated.

Critical Examination: While Sanskritization offers a valuable framework for understanding social change and mobility in India, it has faced several criticisms:

1. Limited Scope of Mobility: It primarily explains positional mobility within the caste system, not structural change. It does not challenge the inherent inequality or hierarchy of the caste system but rather reinforces it by aspiring to its values. It's a 'ladder climbing' process, not a 'ladder breaking' one.
2. Cultural Loss and Homogenization: The process often involves the abandonment of indigenous cultural practices, languages, and traditions of the lower castes, leading to a loss of diversity and a homogenization of culture towards upper-caste norms. This can be seen as a form of cultural assimilation.
3. Exclusion of Economic and Political Factors: Critics argue that Srinivas overemphasized cultural and ritual aspects while underplaying the role of economic and political power in social mobility. Real upward mobility often requires economic upliftment and political empowerment, which Sanskritization alone cannot guarantee. A group might adopt upper-caste customs but still face discrimination due to their economic status or lack of political influence.
4. Reinforcement of Hierarchy: By adopting upper-caste practices, lower castes implicitly validate the superiority of those practices and the hierarchy they represent, rather than questioning the system itself. This can perpetuate the very system they are trying to escape.
5. 'De-Sanskritization': In contemporary India, with the rise of Dalit movements and assertion of distinct identities, there are instances of 'De-Sanskritization' where lower castes reject upper-caste norms and revive their own cultural practices as a form of resistance and identity assertion.

In conclusion, Sanskritization remains a powerful concept for understanding a specific type of cultural and social mobility in India. However, its limitations highlight the need to consider a broader range of factors, including economic, political, and identity-based movements, to fully grasp the complexities of social change in the Indian context.