Algorithm is part of computer science. You an learn it on Khan academy. (you probably werent looking for this but no one was answering)
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Answer:
Hi LizBiz! The answer is Ctrl key on Windows, or Command key for Mac.
Explanation:
The Ctrl (Windows) key or equivalent Command key on Mac has a special purpose which allows special operations to be performed when combined with another action, such as clicking on multiple pictures or files for selection.