The caste system is a rigid form of social stratification most prominently associated with traditional Hindu society in India. It organizes individuals into hierarchical groups based on birth, determining their social status, occupation, and marriage prospects. While other religions have experienced social stratification, the specific structure of the caste system is deeply rooted in Hindu social and religious history.

The term 'caste' is derived from the Portuguese word 'casta', which means 'race', 'lineage', or 'pure breed'. It was used by Portuguese explorers in the 15th and 16th centuries to describe the rigid social stratification system they encountered in India, which they perceived as being based on hereditary purity.

In a closed system of stratification, such as a caste system, social position is determined by birth (ascription) rather than merit. Because movement between strata is restricted or impossible, the concept of equal opportunity is irrelevant, as individuals cannot change their status regardless of their abilities or efforts.

In a closed system of social stratification, such as a rigid caste system, social position is ascribed at birth rather than achieved through merit. Because status is fixed and determined by birth, the concept of equality of opportunity—which implies that individuals can improve their standing through effort—is fundamentally irrelevant to the structure of the system.

A closed system of stratification is one where social mobility is severely restricted or impossible. In such systems, status is typically ascribed at birth, such as in caste systems or slavery, meaning an individual's position in the social hierarchy is fixed and cannot be changed through personal effort or achievement.

Chattel slavery is a specific form of slavery where the enslaved person is legally considered the personal property of the owner. In this system, the owner has total control over the life, labor, and body of the enslaved individual, and this status is often hereditary. It differs from other forms of servitude, such as debt bondage or serfdom, where the individual may retain some legal rights or a different status.

In a closed system of social stratification, such as a caste system, social position is determined by birth (ascribed status) rather than achievement. Because mobility is restricted or impossible, the ideology of equality of opportunity is irrelevant, as individuals cannot change their social standing regardless of their efforts.

A closed society is characterized by rigid social stratification where status is ascribed at birth. In such systems, social mobility is extremely limited or non-existent, and individuals are typically restricted to the occupations and social roles held by their parents. This lack of movement between strata defines the society as closed, contrasting with open systems that allow for merit-based advancement.

The caste system is a classic example of a closed stratification system. In such a system, social status is ascribed at birth, and there is little to no opportunity for social mobility. Individuals are restricted to the social position of their parents, which contrasts sharply with open class systems where achievement determines status.

Slavery is defined as a system of extreme stratification where individuals are legally owned by others as property. This represents the most rigid and absolute form of inequality, as the enslaved person has no legal rights or social mobility, unlike caste or class systems.