Link: https://blog.joshsoftware.com/2020/07/23/active-admin-writing-rspec-for-custom-csv/

Active admin is a great framework for managing website admin side interface. Usually, UI for admin users needs to be more of managing and reporting the business operations than the fancy UI which we build for end-users. So basically Active admin abstracts common business applications in a simple pattern so that developers can use it and implement a beautiful interface with very little effort.