Step 1: Contrast with cultural homogeneity:
A culturally diverse society is the opposite of a culturally homogeneous one, where nearly everyone shares the same language, religion and customs.
Step 2: Give the sociological significance:
Managing cultural diversity - through unity in diversity, secularism and federalism - is a central challenge and strength for a plural society like India.
Final Answer:
Cultural diversity means many different cultural groups (linguistic, religious, regional) living together within one society, as India illustrates through its policy of "unity in diversity".