INI files
The INI file format was originally only used by Windows to store initialization data and configurations. It's now used by many applications even on Linux, such as php.
This is a plain text file with a key associated with a value.
On Linux, the equivalent is a
.conffile.
; a comment
key=value
[section1]
key2=value
key3=value
[section2]
key2=value
Some_key=value