Delhi is the capital city of India, where the government's executive, legislative, and judicial branches are located.

Capital City of India
India's capital city is Delhi.

Reasoning
- Delhi is the capital city of India as per the country's administrative and political structure.
- It is a major hub for government offices, embassies, and political activities.
- The President, Prime Minister, and other important government officials reside and work in Delhi.
- Delhi also houses the Indian Parliament, Supreme Court, and various ministries, making it the center of governance in India.

Historical Significance
- Delhi has a rich historical background and has been a capital city for various empires and kingdoms throughout history.
- It served as the capital of several ancient Indian empires such as the Mughals, Delhi Sultanate, and Mauryan Empire.
- The city has witnessed significant events in Indian history, making it a symbol of India's cultural and political heritage.

Modern Infrastructure
- Delhi is a modern metropolis with a well-developed infrastructure, including an extensive public transportation system, airports, and commercial centers.
- It is home to numerous educational institutions, healthcare facilities, and cultural landmarks that contribute to its status as a prominent capital city.
In conclusion, Delhi serves as the capital city of India due to its political significance, historical relevance, and modern infrastructure, making it a fitting center for the country's governance and administration.