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What you need to know about Docker Image vs. container

Today, it is more than just writing code. It is difficult to develop applications. Docker is an open-source software platform which makes it easier for programmers create, execute, manage and distribute applications. It does this by packing software into standard units called containers. It does this by running the operating system of the computer as a virtual machine. Containers allow developers to isolate their applications from the environment. This eliminates the problem of “it works on your machine” The container contains all the libraries, system tools and code required for the software to function.

Table of Contents
What is a Docker Image? Why do we need it? What is a Docker Container?
To fully understand Docker and its operation, you must be familiar with the terms “Docker image”, “Docker registry”, “Docker container,” and “Docker Engine.” If Docker is a new concept, it may be difficult to grasp all terms. There are many people who are confused about Docker images, containers and their differences.
It is important to understand that Docker images are not incompatible with containers. Images can exist independently from containers, unlike containers, which must run images to exist. This article outlines the differences between Docker images and containers.
What is a Docker Image?
A Docker image is an immutable, permanent template that contains the source code and dependencies, system tools, and other files required to run applications. These templates are read-only and contain instructions for building containers that run on the Docker platform. Once created, they cannot be modified or deleted. This feature is essential to Docker as it ensures that the Docker image you create will work after setting up your virtual Docker machine. Software developers can then experiment and test their software under controlled, reliable conditions.
Docker images show layers that are stacked on top of each other. Although the layers may be different from each other, they could all be dependent on one below them.

Why Docker images are necessary?
You can package up preconfigured server environments and applications and share them with other Docker users. Or you can use Docker images to keep it private for your own purposes.
What is a Docker Container?
A Docker container can be used to quickly create a standard unit that can be used to deploy a specific application. This virtualized environment allows users to isolate apps from the underlying systems. It could be an Ubuntu container or CentOS container depending on the operating system. It could also be used as a container for applications, such as a CakePHP or Tomcat-Ubuntu container.
Docker containers offer strong isolation to ensure that they don’t interfere with other containers or servers that host them. Application security is greatly improved as a result.
Why do we need Docker containers?
A Docker container is nothing but a running image. Because images are templates, you cannot run them or start them. However, you can build a container by using the template as a base. This includes adding a container layer to allow you to make changes to the entire image.
What is the difference between a Docker Image and a Container?
Docker images and containers work together to maximize a Docker’s potential. They do differ slightly, so it could be difficult for a novice to identify. Here are some examples of differences:
Docker imageDocker containerIt’s a read-only file.

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