What are the usage scenarios of VRRP?

The following three scenarios are used as an example:
1. A VRRP backup group is configured to work in master/backup mode. The master router in the VRRP backup group transmits all network traffic.
2. Two VRRP backup groups are configured to work in multi-gateway load balancing mode. Devices in the VRRP backup groups back up each other and load-balance traffic.
3. VRRP backup groups are configured for the gateways connected to CEs in different VPNs. This configuration allows various VRRP backup groups to load balance traffic and hosts at different sites in each VPN to communicate with each other.