Explanation:

Ostracised:
Ostracism is the act of excluding or banishing an individual or a group from a particular social group or society. This can happen for various reasons, such as differences in beliefs, social status, or behavior.

Dalit and S.C:
While Dalit and S.C are terms related to social hierarchy in India, they do not directly refer to the act of excluding or banishing individuals or groups. Dalit refers to those who belong to the lowest caste in the Indian caste system, while S.C stands for Scheduled Castes, which are historically marginalized communities in India.

Significance:
Ostracism can have significant negative impacts on the individuals or groups who are ostracised. It can lead to feelings of isolation, exclusion, and discrimination, which can affect mental health and well-being.

Prevalence:
Ostracism can occur in various contexts, including schools, workplaces, and communities. It can be a form of social control or punishment, used to maintain conformity and cohesion within a group.

Legal Implications:
In some cases, ostracism can also have legal implications, especially if it is based on discrimination or prejudice. Laws and regulations are in place in many countries to protect individuals from unfair treatment or exclusion.

In conclusion, ostracism is a harmful practice that involves excluding or banishing individuals or groups from society. It can have serious consequences on the well-being and rights of those who are ostracised.