SQL Database Concepts Question:

The 'fill factor' option indicate how full SQL Server will create each index page.
When the index page doesn’t have free space for inserting a new row, SQL Server will create new index page and transfer some rows from the previous index page to the new index page. This process is called page split.
If we want to reduce the number of page splits then we can use Fill factor option. Using Fill factor SQL will reserve some space on each index page.
The fill factor is a value from 1 through 100 that indicates the percentage of the index page to be left empty. The default value for fill factor is 0.
If the table contains the data which is not changed frequently then we can set the fill factor option to 100. When the table's data is modified frequently, we can set the fill factor option to 80% or as we want.