The Graphing Calculator is a tool that can evaluate, plot and integrate expressions (or functions). It includes many useful features, like combining multiple graphs, navigation and zoom controls, and saving plotted expressions.
All numeric values are limited to 64bit floating point numbers (approximate range: ±5.0 × 10-324 to ±1.7 × 10308, or 15-16 digits).
Another limitation is the precision of the graph: if the expression has many vertical asymptotes, it may not be plotted correctly.