1️⃣ What is OS-Level Virtualization?

OS-level virtualization, also known as containerization, allows multiple isolated containers to run on a shared operating system kernel. Unlike traditional virtual machines (VMs), which require separate OS instances for each application, containers share the host OS, making them more efficient, lightweight, and faster.

🔹 How is OS-Level Virtualization Different?

• Traditional Virtualization (VMware, VirtualBox, etc.) → Uses hardware-level virtualization, creating multiple full-fledged OS instances on a single physical machine.
• OS-Level Virtualization (Docker, LXC, etc.) → Uses a shared OS kernel, allowing applications to run in isolated environments while consuming fewer resources.

2️⃣ What is Docker?

Docker is an open-source, centralized platform designed to create, deploy, and run applications using containerization. It enables developers to package applications with their dependencies and run them in isolated environments called containers.

→ Docker is a set of “Platform As A Service(PAAS)” that uses O.S level virtualization where as VMware uses hardware level virtualization

→ Docker uses container on the host OS to run applications. It allows applications to use the same.

→ It is an advance version of virtualization. It Design to create, deploy and run application. Docker Engine runs natively on Linux distributions,

→ The tool performs OS level virtualization also known as containerization.

📌 Key Features of Docker:

✅ Lightweight → Containers share the OS kernel, unlike VMs that need separate OS instances.

✅ Fast Deployment → Containers start in seconds compared to VMs that take minutes.

✅ Portability → Containers run consistently across different environments.

✅ Resource Efficiency → Containers use fewer system resources than traditional virtualization.

✅ Isolation → Each container operates independently without interfering with others.