Aseries of instructions that can be grouped together as a single command and are often used to automate a complex set of tasks or a repeated series of tasks are known as:

A macro

Explanation:

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A macro us a rule or a pattern that indicates how an series of instructions (usually a series of characters) should be mapped to a replacement output sequence in order to automate a repeated series of tasks. This is done through a process known as a macro expansion. Macros have two main purposes. First, they can be used to make tasks less repetitive. Second, they can be a tool that allows a programmer to enable code reuse.