WordPress is a Content Management System or CMS. Nearly 1 in 2 of all websites built in the world today are built using WordPress. It has a huge developer base as well as many thousands of hours of YouTube videos, training and support available online.
This makes it very accessible and future proof unlike agencies that use their own custom software to develop websites.
It’s probably the best option for a business owner to have their website built using WordPress as it means you can change your digital agency anytime without risk of loosing the ability to manage your website content yourself.