It is a combination of the words "development" and operations" that helps bring the team that creates the code for a specific project from a client(development) and the team that manages the repositories of the code and makes sure that the code stays reliable and up to date (operations) to deliver better software faster.
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Docker is a software program for building applications based on containers. We use it to demonstrate the importance of containerization such as being able to not worry about compatibility programs such as libraries, OSs etc, because containers handle that for us. Furthermore, Docker is a popular Devops technology because it is associated with deployment such as being able to deploy the program the client wants.
A more comprehensive guide of Docker with command examples
How To Create Your Own Docker Application
Docker For The Absolute Beginners Course For Free With Hands On Labs
Hands On Labs To Get Practice With Commands Associated With Docker
KodeCloud Free Course Youtube Video
Great Video For More Practical Experience With Docker
What is Kubernetes?
It is a open-source management platform that is used to manage the applications associated with Docker such as ones that are containerized(ones that use containers for application development) and overall makes managing Docker like applications much easier.