It is for Security, Safety and Stability with Positive Aura Formation. 
When your Root Chakra is open and balanced, you will feel: 
1. Strong life force energy
2. The will to live
3. Like you belong in the world
4. Safe and secure
5. Physically active
6. Connected to Mother Earth
7. Happy in the present moment
8. Excited about the future 
9. Positive Attitude