Filelight graphically represents a file system as a set of concentric segmented rings (or nested piecharts), aiming to show where disk space is being used. Segments expand from the center, representing files and directories. The size of segments is proportional to the size of the files they represent. Directories have child segments which represent the files they contain. Filelight performs a similar function to the command line tool du, but all the information is shown in a compact graphical fashion.