ListPlot

ListPlot[{y_1y_2, ...}]
plots a list of y-values, assuming integer x-values 1, 2, 3, ...
ListPlot[{{x_1y_1}, {x_2y_2}, ...}]
plots a list of x,y pairs.
ListPlot[{list_1list_2, ...}]
plots a several lists of points.