How do I keep all plots open?

How do I keep plots open (even when function or code finishes) and have new plots just create a new plot (not on same axis or anything)

Also how to save multiple plots? e.g. have a function that everytime is run automatically saves the plot to some folder or something

[Walter Roberson]

Use

figure

and (probably) your new plots will not overwrite the old one.

[Sindar]

Also, "print" saves figures

"print(filename,formattype) saves the current figure to a file using the specified file format, such as print('BarPlot','-dpng'). If the file name does not include an extension, then print appends the appropriate one."

[Samayochita]

Using saveas :

figure; 
plot(x, y); 
saveas(gcf, 'Plot1.png'); % Saves the current figure