TNSDL is a high-level programming language used to create graphical applications on TI-Nspire graphing calculators. It stands for TI-Nspire Software Development Language. The syntax and structure of TNSDL are similar to C, making it relatively easy for students familiar with that language to transition to calculator programming. This makes the language suitable for educational purposes and helps integrate the learning of mathematics and computer science by allowing students to develop graphical programs directly related to their math studies. With TNSDL, programmers can create functions, plot graphs, display mathematical expressions, or even create simple games on TI-Nspire devices.