DevOps — Containerization with Docker

Containers package applications and their dependencies into a single, lightweight unit that can run anywhere. Docker is the most popular container tool used in DevOps. Containers solve problems like inconsistent environments and make deployments faster and more reliable. Unlike virtual machines, containers share the host system's kernel, making them more efficient. Containers are ideal for microservices architecture.

Example: Using Docker to package a web app and run it the same way on a developer's laptop and on production servers.