Docker is an open-source container platform and Kubernetes is a tool to customize the container, Container management software in simple words. It as an open-source tool and that is why the number of companies using Kubernetes is rapidly increasing. The growth of online communities like stack Overflow by 30 percent from last year.
Kubernetes made creating clusters simple with just two commands. Kubernetes has a lot of options to customize the containers and it also has a built-in tool for logging and monitoring. Companies like 9GAG, Intuit, Buffer, Evernote, etc. are using Kubernetes
I would suggest you enroll in this Docker Training Course in case you are interested to learn more about Docker.
You can watch this video to learn more about Kubernetes: