Question regarding columns

Hello there. I've a question regarding a column's type; Is there a type which you can insert as much data in it? To explain it briefly I want to insert data that I am not aware how much will it be. Example that I want to insert a string of 124 cells now, and then insert two strings with 124 cells too. And I want to keep all three of them. Just like a file that I would insert as much as I want in it or is that not possible. Or should I use a file-write/read for this instead?


Thanks in advance!