DevSecOps is the practice of integrating security practices within the DevOps process. It creates a 'security as code' culture with ongoing, flexible collaboration between release engineers and security teams.

Key principles include:
- Security automation
- Early security testing
- Continuous security monitoring
- Security as part of CI/CD pipeline
- Rapid security feedback

Infrastructure Security involves securing all infrastructure components including:

1. **Network Security:**
   - Firewalls
   - VPNs
   - Network segmentation
   - DDoS protection

2. **Cloud Security:**
   - Identity and Access Management (IAM)
   - Encryption
   - Security groups
   - Network ACLs

3. **Host Security:**
   - OS hardening
   - Patch management
   - Antivirus
   - Host-based firewalls