x and y - these boxes are for output only. they display the coordinates of your currently selected point. if the function is undefined for an x value, NaN (not a number) will be displayed.
remove - remove this function.
domain - the values where this function is defined. infinity and negative infinity can simply be typed as "infinity" and "-infinity".
differential equations have some additional input boxes:
initial x, initial y, and initial y' - specify the initial conditions of the differential equation.
color - check this box to give every curve a unique color.
points per x - the number of sample points that the program will compute in the length of one unit in the x axis. higher values increase the accuracy of the approximation, but will require more processing power.
reset - resets everything, just as if you'd reloaded the page. nothing will be saved.
export as image - lets you save the current graph as a png image. does not function on mobile browsers.
this tool was made by max erdwien and phillip dix.