What is the meaning of label in matplotlib.pyplot.plot?why we use label

Course Q&A Machine Learning Specialization Supervised ML: Regression and Classification
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What is the meaning of label in matplotlib.pyplot.plot? Whether I use a label or not, I can’t see the difference.

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In the matplotlib page it describes this as:
https://matplotlib.org/stable/api/_as_gen/matplotlib.artist.Artist.set_label.html#matplotlib.artist.Artist.set_label

Set a label that will be displayed in the legend.