Which of these two is bigger ‘MB or KB’?

MB (megabyte) is bigger than KB (kilobyte).

Explanation:

• 1 MB (Megabyte) = 1,024 KB (Kilobytes)
  This is based on the binary system used in computing, where 1 kilobyte equals 1,024 bytes and 1 megabyte equals 1,024 kilobytes.

Summary:

• MB > KB
  For example, 1 MB is equivalent to 1,024 KB, making it significantly larger.