The delimiter is a character that is used to separate data fields.
Example
You may have the following data:
Northing: 5000 Easting: 2000 Elevation: 100
The data may be delimited as follows:
Space: 5000 2000 100
Comma: 5000, 2000, 100
Semi-colon: 5000; 2000; 100 etc.