You can use Desmos to investigate the beautiful world of integral calculus. Simply type int to get started. Then, fill in the lower bound, upper bound, and the integrand and you'll be on your way!
You can find the integral on the Desmos keyboard by clicking on FUNCTIONS and then MISC. Or, as a shortcut, try typing int directly into the expression line.
You can graph a definite integral by filling in the upper bound, lower bound, and integrand. Don't forget to include dx if integrating with respect to x.
It's also possible to graph the output of some indefinite integrals by including x in the upper bound, 0 in the lower bound, and integrating with respect to a variable other than x.