A Texas Instruments graphing calculator can be used as a basic
calculator, a scientific calculator and a graphing calculator.
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Graphing calculator was created in 1985.
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A graphing calculator is a scientific calculator with a graphing
display window. Otherwise, there are no limits to the type of
calculations that can be made on either of them.
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Usually a graphing calculator should have all the capabilities
you expect from a scientific calculator (and more, since it does
the graphing). For more details, check the manual of your
calculator if you already have one.
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Someone can find a free online graphing calculator at
Meta-Calculator. On Meta-Calculator one can find graphing,
scientific, matrix, statistics, and programmer's calculators.