Meta AI Response: These commands are related to npm (Node Package Manager) and are used in the context of JavaScript projects, particularly those built with frameworks like React, Angular, or Vue.js. Here's a breakdown of each: npm ci: npm ci is similar to npm install, but it's designed for automated environments, such as CI/CD pipelines. It expects a package-lock.json file to ensure consistent dependency installation. If package-lock.json and package.json don't match, npm ci will exit with an error. It's faster than npm install because it skips some user-focused features. npm run build: This command runs the "build" script defined in package.json. It's typically used to prepare your application for production by bundling, minifying, and optimizing code. The exact actions depend on what's specified in the build script, which can vary between projects. npm run dev: This command runs the "dev" script defined in package.json. It's used for development environments, often starting a development server that watches for file changes and hot-reloads the application. Like npm run build, the specific actions depend on the dev script's definition. npm run start: This command runs the "start" script defined in package.json. It's commonly used to start the application in a production environment, though it can also be used in development depending on the project's setup. The start script might simply run the built application or perform other necessary startup tasks. In summary: npm ci is for installing dependencies in automated environments. npm run build prepares the application for production. npm run dev starts the application in development mode, usually with hot-reloading. npm run start starts the application, often in production mode, but it depends on the project's configuration.