What Is a Target Group?
A target group is a logical collection of backends, such as instances, containers, or IP addresses, that a load balancer treats as one routing destination. The load balancer health-checks each member and distributes traffic only to healthy ones. Listener rules decide which target group a request goes to.
Why it matters
Target groups are how blue-green and weighted routing are wired, since you can point listeners at different groups. A deploy job often registers a new group and switches the listener to it.
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