A typical CSV file looks like this, where each line contains the same sequence of data so any program which needs to read it knows what to expect: Product, Size, Color, Price Shirt, Medium, Blue, $14 ...

I might have a spreadsheet or JSON file with tons of data, but the system would only accept a CSV file. CSV. Open source: Must-read coverage. Debian vs Ubuntu: Which Linux Distro Fits Your Needs Best?