<p>It seems there is 2 ways to logically group pods, which are:</p>

<ul>
<li>using labels to identifies organizational units in a loosely coupled fashion</li>
<li>creating namespaces</li>
</ul>

<p>What are exactly the differences and use cases?</p>

<p>Let's begin with a cluster which consists a number of nodes(Virtual Machines or Physical Machines ). Now We will divide our cluster in a logical way </p>

<p><strong>Namespaces</strong>  is a virtual cluster or a logical cluster. It helps us to organise projects or environments (development, testing, staging, and production environments). 
By using <strong>Namespaces</strong>, You can limit the quota to each namespace for resources utilization. You want to be sure that production environment has more than enough resources, so it won't starve to death.</p>

<p><strong>Labels</strong> is a powerful concept in Kubernetes.It's a key-value pair which is assigned to kubernetes resources such as Pods, RepicaSet, Node etc. It is used to organise pods.for instance, ReplicaSet or Service can select the  pods in a k8s cluster by using labels and perform an operation on them such as increasing the number of pods. </p>

<p>I have attached the link for further reading <a href="https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/" rel="noreferrer">labels and Selector</a> and <a href="https://kubernetes.io/docs/concepts/overview/working-with-objects/namespaces/" rel="noreferrer">Namespaces</a>   </p>
