It is a very intuitive, yet powerful math graphing program. It is appropriate for junior high school, high school, and college students. There is an abundance of graphing software available, both shareware and commercial.
Some packages are extremely powerful, yet their interfaces tend to intimidate the average user.
It plots a plethora of functions, and allows almost complete manipulation of the graph range. It maintains a buffer of seven equations, so you can keep track of what you're doing, as well as save the last seven equations you typed and the range. Systems of inequalities are used in many real-world applications, from construction to economics. Very few programs have this ability, and those that do are generally anti-intuitive. It was written to be an education tool, and can be used to help students understand algebraic concepts such as solutions to systems and even simple calculus concepts such as maximums and minimums.