Question: what are mb used for?
Answer: While a megabyte is technically 1,000,000 bytes, megabytes are often used synonymously with mebibytes, which contain 1,048,576 bytes (220 or 1,024 x 1,024 bytes). Megabytes are often used to measure the size of large files. For example, a high resolution JPEG image file might range is size from one to five megabytes.