What's the difference between Helm list and Kubectl get deployments?

Can someone explain the difference between what you get in the outputs of a helm list and kubectl get deployments command ? I'm running these commands on a sever and some entries appear whether you do a 'Helm List' or a 'Kubectl get deployments' command and some entries only appear if you run either of the commands. I am pretty new to this obviously. Any help gratefully received

Helm is some sort of "package manager" for Kubernetes. helm list would give you a list of Helm Charts ("packages") that were applied

kubectl get deployments gives a list of Deployment objects. Which may, or may not, be related to Charts applied onto that namespace.