What mean preview in AKS version ?

Hello All,

I'm planning to upgrade my AKS clusters and targeting the v1.24 when checking the available version i see preview , what does that mean ?

az aks get-versions --location francecentral -o table
KubernetesVersion Upgrades

1.24.0(preview) None available
1.23.8 1.24.0(preview)
1.23.5 1.23.8, 1.24.0(preview)
1.22.11 1.23.5, 1.23.8
1.22.6 1.22.11, 1.23.5, 1.23.8
1.21.14 1.22.6, 1.22.11
1.21.9 1.21.14, 1.22.6, 1.22.11

Thanks .