All you need to know about docker, containers, images and services : 

CONTAINERIZATION

Containerization in Layman Terms

Containerization is a technology used in software development that helps package an application and its dependencies into a single, portable unit called a container. Here’s a simple way to understand it:

Real-World Analogy

Think of containerization like packing a lunchbox. Imagine you have different kinds of food (sandwich, salad, fruit) that you want to take to work. Instead of carrying each item separately and worrying about them mixing or needing different containers at work, you pack everything into one lunchbox. This way, no matter where you go, your lunch stays the same and is ready to eat.

Also, think of Docker containers like shipping containers. Shipping containers have revolutionized global trade by standardizing how goods are transported. No matter what's inside (whether it's electronics, clothes, or furniture), the container looks the same and can be transported easily by ship, train, or truck. Similarly, Docker containers standardize how applications are packaged and transported, making it easier to move them from development to production without changes or issues

What is Containerization?

Containerization is a technology that packages an application and its dependencies (libraries, binaries, configuration files) into a single, isolated unit called a container. This allows the application to run consistently across different computing environments.

Although there are other options for containers, Docker and Kubernetes are the most popular.

Name

Docker

Kubernetes

What is Docker?

Docker is a platform that allows developers to create, deploy, and run applications in containers. Containers are lightweight, standalone, and executable software packages that include everything needed to run a piece of software, including the code, runtime, libraries, and settings.

Importance of Docker

Consistency:

Problem: Developers often face issues where an application runs on their computer but not on another due to differences in configurations and environments.

Solution: Docker containers ensure that the application runs the same way everywhere by packaging everything it needs.

Isolation:

Problem: Running multiple applications on the same system can lead to conflicts, such as different versions of the same library.

Solution: Docker containers keep applications isolated from each other, preventing such conflicts.

Efficiency:

Problem: Virtual machines (VMs) are resource-intensive because they require a full operating system for each application.

Solution: Docker containers share the host system's operating system, making them more lightweight and faster to start compared to VMs.

Portability:

Problem: Moving an application from one environment (like a developer's laptop) to another (like a server) can lead to unexpected issues.

Solution: Docker containers can run on any system that has Docker installed, making it easy to move applications around.