What computer programming is common on graphing calculators?

Question

I'm wondering what computer programming languages do graphing calculators use?

Answer 1

Modern calculators can run almost every compiled programming language without problem, but they also use propietary (meaning exclusive to the brand) languages.
TI runs a version of Basic called TI-Basic, Casio also runs a Basic dialect and HP runs RPL

Answer 2

Thank you, spcan