Throughout December we'll be highlighting a different Netlify feature each day, it might just be the thing you need to unlock those creative juices and dust off that domain you registered but never deployed! On engineering teams and in life, time is often the most valuable yet least plentiful resource, so build plugins are useful tools that can help with caching, optimizations, security, and more. Build plugins allow for customization of workflows by adding functionality to each part of the build process, such as onPreBuild, onBuild, onPostBuild, onError, onSuccess, and onEnd events. With these plugins, developers can automate tedious tasks, run tests, and optimize images, making their development experience more efficient and freeing up time for other important tasks. Netlify provides a wide range of official build plugins and resources to help get started with creating custom plugins.