Containerization is characterized as a sort of OS, through which applications run in separated user spaces called containers, all utilizing an equivalent shared working framework.

Containers :
Containers are referred to as “lightweight,” meaning they share the machine’s working framework part and don’t require the overhead of associating the working framework inside each application.

Containers are intrinsically smaller in capacity than a Virtual Machine, and require less start-up time, permitting distant more containers to run on the same compute capacity as a single Virtual Machine.

Why Containers ?
Rather than virtualizing the hardware stack as with the virtual machine’s approach, containers virtualize at the working framework level, with different holders running on the OS part straightforwardly. This implies that holders are distant more lightweight: they share the OS bit, begin much quicker, and utilize a division of the memory compared to booting a complete OS.

Containerisation :
Containerization has gotten to be a major drift in computer program improvement as an elective or companion to virtualization. It includes encapsulating or bundling up program code and all its conditions so that it can run consistently and reliably on any framework. Containerization permits engineers to make and send applications quicker and more safely.
If the code is created in a particular computing environment, when it is exchanged to a modern area, frequently results in bugs and mistakes. For example, when an engineer exchanges code from a desktop computer to a virtual machine or from a Linux to a Windows working framework. Containerization kills this issue by bundling the application code along with the related arrangement records, libraries, and conditions required for it to run. This single bundle of the computer program or container is preoccupied absent from the host working framework.
Containerization permits applications to be “written once and run anywhere.” This transportability is vital in terms of the improvement process.
The containerization concept is a decade old but the rise of the open-source Docker, an industry standard for containers with fundamental architect devices and all comprehensive bundling approach. Nowadays, Docker is one of the foremost well-known and highly utilized container engine technologies, but it isn’t the only alternative accessible.

How does it work ?
Each container is an executable bundle of programs, running on top of a host OS. A host(s) may support numerous containers (tens, hundreds, or indeed thousands) concurrently, such as within the case of complex microservices engineering that uses various containerized ADCs. This setup works since all containers run negligible, resource-isolated forms that others cannot access.

Application containerization :
Application containerization is an OS-level virtualization strategy utilized to deploy and run distributed applications without propelling a complete virtual machine (VM) for each app. Different disconnected applications or administrations run on a single host and access the same OS kernel. Containers work on bare-metal frameworks, cloud occurrences, and virtual machines, over Linux, Windows, and Mac OSes.

Benefits :
Containerized apps can be promptly conveyed to clients in an advanced workspace. More particularly, containerizing a microservices-based application, a set of Citrix ADCs, or a database includes a wide range of particular benefits, extending from agility during program improvement to simpler controls.
Containerization offers significant benefits to designers and improvement groups. They are

  1. Portability,
  2. Speed,
  3. Fault isolation,
  4. Efficiency,
  5. Security,
  6. Ease of management, etc,…