TIniFile is a Delphi class used for reading and writing ini files (*.ini).
It's defined in IniFiles unit and derives from TCustomIniFile class which provides several ReadX and WriteX functions, each one specialized for reading/writing a specific type of variable, for example:
Read
- ReadString
 - ReadInteger
 - ReadFloat
 - ReadDateTime
 - ...
 
WriteX
- WriteString
 - WriteInteger
 - WriteFloat
 - WriteDateTime
 - ...