| incoming links | A link coming from another website to your site. |
| serp source | Refers to a snapshot of the Search Engine Results Page where SEMrush gathered its data. When SEMrush determines a ranking for a domain/keyword, you can see the ranking reflected in the SERP Source. Once you click the icon, a pop-up window will be displayed asking you to View the SERP and then you can see the screenshot. |
| serp volatility | SERP Volatility stands for ranking fluctuations. Variation in the algorithmical SERP may occur due to changes in the content of a ranking page, the number of inbound links pointing to that page, the competitiveness of a given keyword or niche, etc. This fluctuations may appear even daily or hourly. |
| serp shadow | Noun phrase. The group of URLs listed below any given Website. Every listing in a SERP except the last one in the search results (page). If your site is ranked 2nd for keyword then your listing is in the 1st-ranked sites SERP shadow but the 3rd listing is in your SERP shadow (and the 1st sites). |
| widgets | tiny applications that are used on web pages to provide specific functions. |
