Calculations

At its most basic, Desmos is a graphing calculator. You can use it for basic calculations:

basic calculation

or even more complex calculations like integrals:

sum calculation

or sums:

integral calculation

Graphs

And of course, it's very easy to graph simple functions, their derivatives, evaluate those functions and derivatives, etc.

simple graph

You can also modify colors, change line styles, add points, label those points, and more.

graph with modifications