Files, folders, and formats

A spreadsheet-like text file where each row is a line and each cell is separated by a comma.

The three or four letters after the dot in a filename. Tells the computer what kind of file it is.

A way of writing structured information so both humans and computers can read it.

A simple way of writing formatted text using plain characters — stars for bold, hashes for headings.

Text with no formatting, fonts, or styling — just the characters themselves.

The file at the top of a project that explains what it is and how to use it.

A description of the shape that data is supposed to take.

Another way of writing structured information, designed to be easier for humans to read than JSON.