Docker

What is Docker?

A platform that uses containerization technology to package applications and their dependencies into lightweight, portable containers. Containers run consistently across different environments, from development laptops to production servers. Uses OS-level virtualization to deliver software in packages called containers. Enables "build once, run anywhere" philosophy. Powers modern DevOps practices and microservices architectures. Used by companies like Netflix, PayPal, and Uber for scalable deployments.

When to use it

• Essential for modern DevOps workflows, enabling consistent environments from development to production.
• Perfect for microservices architectures, CI/CD pipelines, and cloud deployments.
• Ideal when you need to isolate applications, ensure reproducibility, or simplify deployment processes.
• Commonly used with Kubernetes for orchestration, in cloud platforms, and for local development environments.

When NOT to use it

• Simple applications that run fine without containers - adds unnecessary complexity
• When you need maximum performance - containers have slight overhead
• Very small projects or prototypes - traditional deployment is simpler
• When team lacks containerization experience - learning curve can slow development

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