The term "Mobile First Index" refers to a change in Google's search algorithm that favours the mobile version of a website. In other words, Google now ranks websites based on the mobile version instead of the desktop version.
This is due to the fact that more and more users are using mobile devices to browse the internet. For this reason, Google has decided to adjust its ranking criteria accordingly to ensure that users have a better experience and that websites that are optimised for mobile devices are given preference.
For search engine optimisation (SEO), this means that it is now more important than ever to have a mobile-optimised version of the website. Websites that are not optimised for mobile devices can be penalised in Google's search results and rank lower. Therefore, web designers and SEO experts need to ensure that the website is optimised for all devices and screen sizes to ensure high visibility in Google's search results.
A mobile-optimised website should offer a fast loading time, user-friendly navigation and easy readability on small screens. It is also important that the website works well on all mobile devices, regardless of the platform or operating system.
The mobile first index is therefore an important development in the field of search engine optimisation and web design. A well-optimised website that is optimised for both desktop and mobile devices can lead to higher visibility in search engine results and ultimately to a higher conversion rate.