What are the different types of security?

All in all there are only TWO types of Security measures -- Physical Security and Digital Security. These two have its subcategories composed of the following.

Physical Security:

1. Outer Perimeter Security

2. Natural Access Control

3. Territorial Reinforcement

4. Inner Perimeter Security

Digital Security Systems:

1. Monitored System

2. Unmonitored System

3. Wireless Alarm System

4. Electric Current Home Alarm