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Orders of magnitude of data. The yottabyte is a multiple of the unit byte for digital information. The prefix yotta indicates multiplication by the eighth power of 1000 or 1024 in the International System of Units (SI), and therefore one yottabyte is one septillion (one long scale quadrillion) bytes. The unit symbol for the yottabyte is YB.
A Yottabyte is equal to 10 to the 24th power of bytes, or a trillion terabytes, or a about 250 trillion DVD's. A Gigabyte is much bigger than a megabyte. As you see the chart says it all, A Gigabyte is 1024 megabytes. GB is bigger than MB as pointed rightly by all the answers below. its sufficient I guess and by the way your ans is GB is bigger than MB.