Could somebody explain to me what an abstract activity is? I have looked in several dictionaries but it is not clear. I mean in a general sense, nothing to do with computer science! Is it something like a separate activity, not connected to another?
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Abstract is from a Latin word meaning "pulled away, detached," and the basic idea is of something detached from physical, or concrete, reality. It is frequently used of ideas, meaning that they don't have a clear applicability to real life, and of art, meaning that it doesn't pictorially represent reality. It is also used as a noun, especially in the phrase "in the abstract" , and as a verb (accented on the second syllable), meaning "to remove."
So if I understand well:
Counting from 1 to 10 in your head
is an exemple of abstract activity.