I am currently studying about plotting techniques in R while studying I came across one problem is that if I have more than one plot and I want to plot all the simultaneously how this can be done in R.

for example I have four plot

p1 = ggplot(…)

p2 = ggplot(…)

p3 = ggplot(…)

p4 = ggplot(…)

How to plot all these plots at a time.