Docker

Docker is a containerization platform that enables developers to package applications and their dependencies into isolated, portable units called containers. These containers share the host operating system’s kernel, making them lightweight and faster than traditional virtual machines. Written in Go, Docker uses a client-server model with components such as the Docker Engine, Docker Daemon, and Docker CLI. 

Developers can create images—read-only templates that define containers—and share them through registries like Docker Hub. Tools like Docker Compose simplify running multi-container applications, while Docker Desktop provides a user-friendly interface for building and managing containers locally. Docker ensures applications run consistently across development, testing, and production environments, solving the “works on my machine” problem. 

It integrates seamlessly with CI/CD pipelines, cloud platforms, and orchestration tools like Kubernetes, making it essential for modern DevOps practices. With its speed, scalability, and efficiency, Docker has become a standard for deploying and managing microservices-based applications.