One of the most basic and yet essential software items every business requires is the accounting system. Available from a wide number of vendors, accounting systems help organisations keep track of their expenses and income, with varying levels of sophistication going from simple General Ledgers right through to mini-Enterprise Resource Planning solutions. Many accounting systems offer extensibility and integration with add-ons, allowing the user to go from a standard setup to a customised software environment more capable of handling various tasks related to or influenced by accounting data.