Accounting involves identifying, measuring, recording, classifying, summarizing, and communicating financial information about an entity's economic activities. It is the process of recording, classifying, and summarizing financial transactions and analyzing, verifying, and reporting the results. The double-entry system is used, in which every transaction has equal and opposite effects in at least two different accounts. This ensures accuracy and consistency in accounting. There are three main types of accounts - real, personal, and nominal - which are used to record different types of financial transactions following specific debit and credit rules.