What is Auto Sum Feature in Excel Spread Sheet?

https://www.computersprofessor.com/2016/05/what-is-auto-sum-feature-in-excel.html
The auto sum feature is available on
the standard tool base in excel, which is used ot accumulate the numerical
values stored in the cell. It means the total sum is calculated and appers in
the cell in which the auto sum is given either horizontally or vertically.
Here C1 is the cell that calculates
the auto sum ($) has 60 horizontally. Similarly A4 is the cell that contains 90
vertically of after applying the function.