A text qualifier is used to distinguish between data for calculations and descriptive text (strings).
Examples
Text qualifier: "
"Point 1", 5000, 2500, 100, ... "Point 2", 5010, 2600, 101, ...
Text Qualifier: '
'Point 1', 5000, 2500, 100, ... 'Point 2', 5010, 2600, 101, ...
Text Qualifier:(none)
Point 1, 5000, 2500, 100, ... Point 2, 5010, 2600, 101, ...