Who discovered parametric functions?

Parametric functions, as a mathematical concept, do not have a single discoverer, as they have evolved over time through the contributions of various mathematicians. The use of parameters to define relationships between variables can be traced back to early work in geometry and calculus by figures like Isaac newton and Gottfried Wilhelm Leibniz in the 17th century. However, the formalization of parametric equations as a distinct concept emerged later, with contributions from mathematicians during the 19th century.