As with any profession, accountants have developed a language of their own. The joke is that all the accounting standards, together with company law and charity law state that the aim is make accounts more 'decision useful'. In other words they say that the aim is to make them more understandable.
Others may think that the whole point is to make them less understandable so that people have to employ accountants to explain them!
To help, the following list is a 'rough' interpretation of some of the jargon used in accounting. These definitions would not stand up to rigorous criticism, but they'll do for now.