Live state
The live state of that application. What pods etc are deployed.Target state
The desired state of an application, as represented by files in a Git repository.Sync
The process of making an application move to its target state. E.g. by applying changes to a Kubernetes cluster.Refresh
Compare the latest code in Git with the live state. Figure out what is different.
ソースコードとlive stateを比較するのがrefreshで、クラスターに変更を適用するのがsync(わかりづらい)