What CSV is
CSV is a text file where each line is a row and commas separate the fields. There is no type system, no formatting and no second sheet. Every value is text until something downstream decides otherwise.
Almost every database, analytics tool and spreadsheet can read and write it, which is why exports default to it.
What Qlik is
A Qlik load script block using LOAD INLINE, which embeds the data in the script itself.
QlikView and Qlik Sense developers.
What changes when you convert CSV to Qlik
Reading CSV means deciding three things the file does not state: which character separates fields, how quotes work, and what encoding the bytes are in. Tablizer sniffs the delimiter from the first few lines, handles quoted fields containing commas and newlines, and reads the file as UTF-8.
Suitable for small reference tables. For anything large, load from a file instead.
What carries over from CSV to Qlik
CSV records 2 things about a table that Qlik has no way to hold.
Qlik wants a type for each column, and CSV does not record one, so each column is typed from what its values look like. A column of digits that should stay text - a zip code, a phone number, a leading-zero id - is the usual thing to check afterwards.
A line break inside a cell ends the row in Qlik, so line breaks are replaced rather than carried through.
Qlik marks its header cells differently from its data cells, so the first row is written with that marker.
CSV can be read one record at a time. Qlik has to be complete before it means anything, so the whole table is held in memory while it is written and a file that gets cut off part way through is not partly usable - it is unusable.
The identifier 007 comes out of the Qlik as 007. Reading it as a number would have made it 7, and an id that changes value is worse than one that stays text.
The role "Analyst, data" survives with its comma, in one cell rather than split across two. That is the first thing to check in any converted table, and the usual place a Qlik file goes wrong.
The quotes around Jonah "Jo" Pryce are left as a plain quote character in the Qlik.