[Python] What does axis in pandas mean?

Here is my code to generate a dataframe:

import pandas as pd
import numpy as np

dff = pd.DataFrame(np.random.randn(1, 2), columns=list('AB'))


then I got the dataframe:

A B
0 0.626386 1.52325


When I type the command dff.mean(axis=1), I get:

0 1.074821
dtype: float64


According to the reference of pandas, axis=1 stands for columns and I expect the result of the command to be

A 0.626386
B 1.523255
dtype: float64


So what does axis in pandas mean?

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