Advantages

Reduce cost implementation (We don’t need to use lease line/ ISDN/ FR, mobile only need to dial local ISP to connect to branch office)
Security (VPN provide strong security mechanism through encryption, authentication etc.)
Lower cost (Bring down cost of Wan equipment)
More Flexible
Simple Management
Tunnel topology
Interoperability of devices from multiple vendors
Centralized VPN management
Easy implementation
Easy usability
Scalability
Performance
Bandwidth management
Service provider’s infrastructure
High availability
Protect traffic across internet
Protect data through hackers
Protect through eavesdropping
Protect through Man-in-Middle attack

Disadvantages