What is modeling language?

Answer 1

A modeling language is a special purpose computer language (but not actually a programming language) for describing real world systems (e.g. electronic, mechanical, aerodynamic, hydraulic, chemical, atomic) to a computer so that it can create a mathematical model of the system and perform simulations, so the behavior of the system can be determined without having to go to the expense of building actual experimental prototype models and testing them in the real world.

Such languages are very important, especially when actual real world tests are either extremely dangerous and/or prohibited (e.g. nuclear explosive tests which have been banned in most countries by international treaty are all done now by computer simulation using a few modeling languages developed between the late 1950s and early 1990s using highly parallel very fast supercomputers). But they are also important for bringing new products to market quickly and at low cost.