Step 1: Understanding the Concept:
This is a basic factual question about the Varna system, the classical four-fold social hierarchy of ancient India.
Step 2: Detailed Explanation:
The ancient Indian society, as described in Vedic texts like the Rigveda, was ideologically divided into four Varnas. These are:
1. Brahmin: Priests, scholars, and teachers.
2. Kshatriya: Warriors, rulers, and administrators.
3. Vaishya: Merchants, traders, and farmers.
4. Shudra: Laborers and service providers.
A fifth category, the 'untouchables' or Avarna, was considered outside this four-fold system.
Step 3: Final Answer:
Ancient Indian society was divided into four Varnas.