Important sections of the Delphi class are the uses sections (interface and implementation).
In the case that you need code from another unit available in Delphi, the use unit provides the possibility to add a unit to the uses section.
Example: Get the working directory with the function getCurrentDir from System.Sysutils
Depending on what you need, you can select if the use must be added to interface or implementation section. By default implementation is selected
