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What is CRC32?
On which situation we will go for CRC32?
how we will use CRC32?

Please use the Search facility. You'd have your answers in detail with various discussions on its usage.

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Doing a cyclical redundancy check (CRC) on a text string or file will return a number - it used to be a 16 bit number but is now a 32 bit number. Changing just one byte of a file will result in the CRC32 result changing as well. This type of check was implemented for data transfers; it ensures (well, it tries to ensure) that a transmission was received exactly as it was transmitted by doing a CRC32 on both sides and comparing the result.

When one does change data detection it is often advisable to use a CRC32 algorithm. Let's take a table 1000 rows of 100 columns of Char(10). If you want to compare the old record with the new one, you would need to store 1Mb of old data. If you just save the CRC32 of the old record the storage required is much less at 32Kb!