Kubernetes was designed to orchestration multiple container and replication

With the help of multiple container we can get following things

a. Reliability :

By having multiple version of an application, you prevent problem by one or more fails

b. Load Balancing:

By having multiple container of an application, enable you to easily send traffic to diff-2 instance to

prevent overloading of a single instance or node

c. Scaling:

When load become too much for existing instance then k8s enable you to easily up your application

with additional resources. And when load decrease then scale down is also possible.

d. Rolling Update:

Update to a service by replacing pods one by one.