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Keyboard accessibility is an important part of the user experience. There are multiple criteria in Web Content Accessibility Guidelines (WCAG) about this topic. Still, it’s somehow overlooked, affecting the experience of many users, mainly people with motor disabilities — any condition that limits movement or coordination.
Certain conditions like having a broken arm, the loss or damage of a limb, muscular dystrophy, arthritis, and some others can make it impossible for a person to use a mouse to navigate a site. So, making a site navigable via keyboard is a very important part of ensuring the accessibility and usability of our websites.
The importance of making a site accessible for users with motor disabilities becomes even more evident when you learn that they have access to more assistive technology options. Keyboards are not even the main focus of motor disability assistance! There are tools like switches that you use with your hand (or even with your head) to work with any device, which helps a lot for people with more severe motor disabilities. You can see how those technologies work in this demonstration made by Rob Dodson or in this video of Christopher Hills.