What are parametric and Non-Parametric Machine Learning Models?

Machine Learning algorithms are basically mathematical functions that try to find a relationship between input and output variables. If we have tabular data with columns'Experience' (input) and'Salary'(target), We are trying to find a relationship between input and target. As experience changes, salary also changes. The function y f(x) tries to find the relationship between the input feature x and the target y. But sometimes we may know or may not know the nature of the function.