Mobile usability is important in SEO because it can directly impact the user experience of people visiting your site on a mobile device. If a website is not mobile-friendly, it can be difficult or even impossible for users to interact with it on a mobile device. This can lead to a high bounce rate (the percentage of users who leave a site after viewing just one page), which can in turn lead to a lower ranking in Google’s search results.
On the other hand, a website that is optimized for mobile can provide a better user experience, which can help reduce the bounce rate and improve the ranking of the site in search results. Mobile usability is particularly important because an increasing number of users are accessing the internet exclusively through mobile devices, so it is crucial for websites to be designed with these users in mind.
In addition, Google has stated that mobile-friendliness is a ranking factor in its search algorithm, so having a mobile-friendly website can directly impact your site’s search engine rankings.