what does namespace do kubernetes code example

Example 1: kubernetes get namespace

# Get Namespaces for current cluster
kubectl get namespaces

Example 2: kubernetes java client create namespace

V1Namespace ns = new V1Namespace().metadata(new V1ObjectMeta().name("new-namespace"));
CoreV1Api api = new CoreV1Api();
V1Namespace createdNamespace = api.createNamespace(ns, null, null, null);