Definition and Explanation:
Accounting is the language of      business. Affairs of a business unit are made understood to others as well      as to those who own or manage it through accounting information which has to      be suitably recorded, classified, summarized and presented.  
In order to make      this language to convey the same meaning to all people, it is necessary that      it should be based on certain uniform scientifically laid down standards.      These standards are termed as accounting principles.      Accounting principles may be defined as those rules of action or conduct      which are adopted by the accountants universally while recording accounting      transactions. In the absence of common principles there will be a chaotic      situation and every accountant will have his own principles. Not only the      utility of accounts will be less but these will not be comparable even in      the same business. Therefore, it become essential that common principles      should be followed for measuring business revenues and expenses.
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Essential Features of Accounting Principles:
Accounting principles are      accepted if they satisfy the following norms:
Usefulness:
A principle will be relevant      only if it satisfies the needs of those who use it. The accounting      principles should be able to provide useful information to its users      otherwise it will not serve the purpose.
Objectivity:
A principle will be said to be      objective if it is based on facts and figures. There should not be a scope      for personal bias. If the principle can be influenced by the personal bias      of users, it will not be objective and its usefulness will be limited.
Feasibility:
The accounting principle      should be practicable. The principles should be easy to use otherwise their      utility will be limited.
Classification of Accounting principles:
Accounting principles can be      classified into two kinds:
-               Accounting Concepts:
 
 The term concepts includes those basic assumptions or conditions upon which accounting is based. Click here to read full article.
 
-               Accounting Conventions:
 
 The term "conventions" includes those customs or traditions which guide the accountants while preparing the accounting statements.
     Accounting      Equation:
Dual aspect may be stated as      "for every debit, there is a credit." Every transaction should have twofold      effect to the extent of the same amount. This concept has resulted in      accounting equation which states that at any point of time the assets of      any entity must be equal (in monetary terms) to the total of equities.