Google uses sophisticated methods to locate, gather, and consolidate vast data to give users relevant results. The search engine is restricted by response time and various other factors when working with these various data types. The search results vary frequently based on factors such as search history, location, interests, and the device used.
Google search results can vary not only on different devices but also on the same device, even when using the same search term. Google also changes the order of search results based on user experience considerations. Therefore, on mobile phones, various elements are removed and replaced by visual elements to avoid distraction. So, mobile SEO can be vastly different from desktop SEO.
Since people spend more than 70% of their internet time on mobile phones, its impact is visible on Google SERPs. Google has also announced its mobile-first indexing policy. So, it's crucial to know the difference between mobile SEO and desktop SEO.