what is the difference between LTM actvie-active and active-standby? plaese~~~^^

In active active , both devices actively process application traffic, each for a different application. One device processes its application traffic using the configuration objects associated with the default floating traffic group, traffic-group-1. By default, this traffic group contains the floating self IP addresses of the default VLANs. The other device processes its application traffic using a second traffic group that we create.

In active standby only the active box process traffic and incase of active failure standby will become active and it will process the traffic.