Parameters are the values that determine what data will be returned for a given report. Different reports may contain different parameter types. A common example of a parameter is the date parameter, which is commonly used to generate date ranges, event dates, etc.
There are two ways to enter values for a date parameter. The first is Constant Values, meaning the user will choose a specific date (either by typing the date or by choosing it from the calendar widget). The other is referred to as an Automatic Value, which includes options like Beginning of Month, End of Month, Beginning of Week, End of Week, etc. When using Automatic Values, the user can also put a plus/minus number of days value as well.