Answer:
Macros are used to make a sequence of computing instructions available to the programmer as a single program statement, making the programming task less tedious and less error-prone. (Thus, they are called "macros" because a "big" block of code can be expanded from a "small" sequence of characters.) Excel macros are written VBA (Visual Basic for Applications). Those scripts can (potentially) gain access to your operating system, and file system: deleting files, uploading data, downloading spyware etc. ... Macros written with malicious intent could harm your computer, the same way any malware could.
Explanation:
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