CSV files are simple text files. A way to look at it is to use a text editor. But CSV files contain structured data and can be hard to navigate with a text editor.

The easier way to open a CSV file is using a spreadsheet application. Datablist, Microsoft Excel, Apple Numbers, or Google Sheets can open .csv files. Once open, you will be able to view and edit your data directly in the spreadsheet application.

CSV file in Google Sheets
CSV file in Google Sheets

However, larger files (more than 1 million rows) are incompatible with spreadsheet tools. For those files, use data analytics software, big data tools, or custom development to process your files.