Accountancy, or accounting, is the production of financial records about an organization. Accountancy generally produces financial statements that show in money terms the economic resources under the control of management; selecting information that is relevant and representing it faithfully. Accountancy overlaps heavily with bookkeeping, auditing and taxation.
Many laborious practices have been simplified with the help of computer software. Enterprise resource planning (ERP) software provides a comprehensive, centralized, integrated source of information that companies can use to manage all major business processes, from purchasing to manufacturing to human resources. This software can replace up to 200 individual software programs that were previously used. Computer integrated manufacturing allows products to be made and completely untouched by human hands and can increase production by having less errors in the manufacturing process. Computers have reduced the cost of accumulating, storing, and reporting managerial accounting information and have made it possible to produce a more detailed account of all data that is entered into any given system. Computers have changed business to business interaction through e-commerce. Rather than dealing with multiple companies to purchase products a business can purchase a product at a less expensive price and take out the third party and vastly reduces expenses companies once accrued. Inter-organizational information system enable suppliers and businesses to be connected at all times. When a company is low on a product the supplier will be notified and fulfill an order immediately which eliminates the need for someone to do inventory, fill out the proper documents, send them out and wait for their products. 
Accounting is thousands of years old. Accounting records, which date back more than 7,000 years, were found in Mesopotamia (Assyrians). The people of that time relied on primitive accounting methods to record the growth of crops and herds. Accounting evolved, improving over the years and advancing as business advanced.
Early accounts served mainly to assist the memory of the businessperson and the audience for the account was the proprietor or record keeper alone. Cruder forms of accounting were inadequate for the problems created by a business entity involving multiple investors, so double-entry bookkeeping first emerged in northern Italy in the 14th century, where trading ventures began to require more capital than a single individual was able to invest. The development of joint-stock companies created wider audiences for accounts, as investors without firsthand knowledge of their operations relied on accounts to provide the requisite information. This development resulted in a split of accounting systems for internal (i.e. management accounting) and external (i.e. financial accounting) purposes, and subsequently also in accounting and disclosure regulations and a growing need for independent attestation of external accounts by auditors.
Today, accounting is called "the language of business" because it is the vehicle for reporting financial information about a business entity to many different groups of people. Accounting that concentrates on reporting to people inside the business entity is called management accounting and is used to provide information to employees, managers, owner-managers and auditors. Management accounting is concerned primarily with providing a basis for making management or operating decisions. Accounting that provides information to people outside the business entity is called financial accounting and provides information to present and potential shareholders, creditors such as banks or vendors, financial analysts, economists, and government agencies. Because these users have different needs, the presentation of financial accounts is very structured and subject to many more rules than management accounting. The body of rules that governs financial accounting in a given jurisdiction is called Generally Accepted Accounting Principles, or GAAP. Other rules include International Financial Reporting Standards, or IFRS, or US GAAP.Source: http://en.wikipedia.org/wiki/Accountancy