Did Docker invent containers?

No. The underlying technology (Linux cgroups and namespaces) existed for years before Docker. What Docker did was create a beautiful, easy-to-use Developer Interface around this complex technology, making it accessible to the masses.

Are Containers as secure as VMs?

Technically, no. Because a VM simulates hardware, it provides a stronger security boundary. Because Containers share the Host OS kernel, a severe vulnerability in the kernel could theoretically allow a hacker to 'escape' the container. However, for 99% of web applications, container security is more than sufficient.

Do I need Linux to run Docker?

Docker relies on Linux kernel features. However, Docker Desktop for Mac and Windows actually runs a highly optimized, hidden Linux VM in the background to provide those features, allowing you to use Docker seamlessly on any OS.

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The 'It Works on My Machine' Problem

Understand the historical context of environmental discrepancies in software engineering. Learn why Virtual Machines failed as a scalable solution and how Docker Containers revolutionized the industry by introducing lightweight, guaranteed execution environments.

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