Traditional CMS combines content and presentation in a single solution. Kentico Kontent combines the content admin component and a method to get information in and out using an API. The focus is on the content and the workflows that support it. The final presentation is completely separate from this content. How you display the content is not the concern of the CMS, only the content itself is. A traditional CMS will also focus on the web as the primary - if not only - delivery channel. Headless CMS embraces many delivery channels to reach target audiences.