Use this to create a form field that accepts whole numbers (integers) or decimals (floats).  By default, the number field allows for decimal values.  This is not to be used for formatted numerical character fields or fields requiring a leading/trailing zero like zip codes or phone numbers. 

In the Validation section, you can set the number field to only accept integers, set an acceptable range of values, or set the allowed increments in values (such as .25, .5, .75, 0) 

In the Display options section you can set the numeric field to be a text input field or select list, add symbols before or after the number, set how many decimal places are allowed, as well as choose your format for separators/decimal points.  The prefix & postfix values are not saved into the database; they are merely helper text/labels.