Final answer:
The unit that measures millions of bytes of data is megabytes (MB).
Step-by-step explanation:
The unit that measures millions of bytes of data is megabytes (MB).
Computer storage space is measured in units called kilobytes (KB), and each KB is equal to 1,024 bytes. Each megabyte (MB) is equal to 1024 kilobytes, and each gigabyte (GB) is equal to 1024 megabytes. Therefore, when dealing with millions of bytes, you would use the unit megabytes (MB).