What is the meaning of correlation for string?

screen 5 in working with missing data, we calculate the correlation for columns, but the dtype of most column is ‘string’. so what is the meaning of correlation for string?

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Working With Missing Data | Dataquest

The correlation is calculated on the number of missing values:

missing_corr = mvc[cols_with_missing_vals].isnull().corr()

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Got it. thanks for your comments.