Delimited: This option separates the values of a cell based a delimiter such as a comma or tab. Each side of the delimiter will go into its own cell. Fixed width: Separates the values into columns with spaces between the fields.

For example, if you want to separate a first name from a last name (and the two names are separated by a space), check the “Space” option. Check the preview at the bottom of the window to make sure it looks right.