A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
A delimiter is any character chosen to separate one element in a string from another element. As Ronnie pointed out above it is commonly used in files to separate the fields in each record (comma or tab), and the records from each other (carriage return and/or line feed).
A delimiter is also used in dates (dash or slash): 12/25/2012 or 12-25-2012
A delimiter is used in times (colon): 10:32:00 AM
A delimiter is used to separate parameters in a call to a subroutine (comma):
SubroutineName Parameter1, Parameter2, Parameter3
or in a function call in a cell:
=SUM(A1,B1,C1)
A space is even considered a delimiter in a line of code:
A = B + C
Kevin