To spread or promote (an idea, theory, etc.) widely.

फैलाना

English Usage: They are propagating their beliefs throughout the community.

Hindi Usage: वे अपने विश्वासों को सामुदायिक रूप से फैला रहे हैं।

The act of spreading or promoting something.

प्रसार

English Usage: The propagation of new ideas is essential for progress.

Hindi Usage: नई विचारों का प्रसार प्रगति के लिए आवश्यक है।