What are the "axis" in the mean-variance-standard deviation data analysis project?

Tell us what’s happening:
I’m just trying to get a better understanding for this part. I don’t get what is meant by “axis 1” and “axis 2”. Any help would be great!

Your code so far
Nothing to really show yet. I’ve got like 7 lines of code.

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Challenge: Mean-Variance-Standard Deviation Calculator

Link to the challenge:

The axis indicates whether you wish to group rows or columns in a numpy array.