'Difference between namespace install vs managed namespace install in Argo Workflows?

I am trying to install argo workflows and looking at the documentation I can see 3 different types of installation https://argoproj.github.io/argo-workflows/installation/.

Can anybody give some clarity on the namespace install vs managed namespace install? If its a managed namespace, how can I tell the managed namespace? Should I edit the k8's manifest for deployment? What benefit it can provide compared to simple namespace install ?



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