Simple Answer

The primary sector is the foundation of the economy because it provides food and raw materials.

Importance

1. Provides Food: Farmers grow food grains for people.
2. Provides Raw Materials: It supplies cotton, iron ore and sugarcane to factories.
3. Provides Employment: Many people earn their living through farming, fishing and mining.

Real-Life Example:

A farmer grows wheat. People use it to make food, and flour mills use it to produce flour.

Remember for Exams: The primary sector provides food, raw materials and employment. It forms the foundation of the economy.