1️⃣ What is Docker and How Does it Work? Why Do We Need Docker?

→ Docker is a containerization platform that allows developers to package applications along with their dependencies into isolated environments called containers. These containers ensure that applications run consistently across different environments (development, testing, production) without compatibility issues.

🛠 How Does Docker Work?

→ Docker works by creating lightweight, portable containers that run on the host machine’s operating system instead of requiring a separate virtual machine. Containers use a shared kernel but have their own libraries, dependencies, and runtime, making them efficient, fast, and scalable.

2️⃣ Understanding Virtualization Before Docker

💡 Basic Concept of Virtualization

Before Docker, developers used virtual machines (VMs) to run applications in isolated environments. A VM runs a full operating system (OS) on top of a hypervisor, which simulates hardware and allows multiple OS instances on a single machine.

🔹 Example of Virtualization:

• A developer runs multiple applications on a single server using multiple VMs, each with its own OS.
• These VMs consume a lot of system resources (RAM, CPU, Storage) because each requires a full OS instance.

3️⃣ 🚨 Disadvantages of Virtualization

While virtualization solved hardware dependency issues, it introduced several problems, including:

⚠️ Key Drawbacks of Virtualization: