Ordinary vs Partial Differential Equations
When we operate with functions we often come across differential equations. specifically the two must used are ordinary differential equations and partial differential equations.
A function is basically a relationship between a dependent variable and a independent variable i.e
y=f(x)
in this the variable y is dependent on a single variable x.
A function can also be dependent on more than one variable like below
y=f(x1,x2,x3)
So when we differentiate a function where there is only one dependent variable then those are called ordinary differential equations and when we differentiate a function with more than one dependent variable those are called partial differential equations.