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GAAP (General Accepted Accounting standards) are used in the USA. It’s a financial reporting framework like IFRS (International Financial Reporting Standards) but the main difference is that GAAPs are based on rule based approach and IFRS are based on principle approach.
It depends on where your company is located and applicable accounting framework there.
If you are looking for a particular accounting treatment difference you better refer to a text book, you can find online from Pwc website.
USA is also planning to follow IFRS framework (don’t know exact deadline).