Stop words are common, like a, at, is, of, on, and the. These words used to be ignored by search engines to speed up their indexing time.
The exclusion of these types of words does not affect the search queries. Look at the two following examples.
- Restaurants in Spalding Michigan
- Restaurants Spalding Michigan
In the first example, “Restaurants in Spalding Michigan” is more likely to be used on laptops.
In the 2nd example, “Restaurants Spalding Michigan” is more likely to be used on mobile phones.
Mobile SEO took these examples into factor when doing SEO that was geared to mobile phones only.