What is the function to create a legend for a plot in MATLAB?

The function used to create a legend for a plot in MATLAB is indeed labeled as "legend()". This function allows you to add descriptive labels to the plotted data, making it easier for viewers to understand which lines or data series represent specific sets of information within your plot.

When you call "legend()" within your code and pass the desired labels, MATLAB automatically generates a legend box that associates each label with the corresponding plot element based on their order. This feature enhances the clarity of the data visualization significantly.

The other options provided do not serve this specific purpose. "plotLegend()" and "labelPlot()" do not exist in MATLAB as built-in functions; therefore, they cannot be utilized for this task. "annotation()" is another function offered by MATLAB, but it is used for adding text or graphical annotations to a figure rather than creating a legend for plots.