A path function is one where it the value of the function depends on the path you took from the initial and final state. Work and Heat are path functions.

A "point function" is one that only has points as values rather than being continuous. The only point functions in thermodynamics are where the thermodynamic conditions are fully constrained - such as pure component triple points and critical points. At the triple point vapor, liquid, and solid can coexist in equilibrium. That only happens at a single temperature and pressure. Likewise, the critical point only occurs at the critical temperature and pressure. If you have a mixture, you get a continuous function over a composition range rather than a single point.

If by "point function" the questioner meant to refer to those functions/properties where the value only depends on the point where you start and the point where you end, the correct name is "state function". In thermodynamics changes in internal energy, enthalpy, Helmoltz energy, and Gibbs free energy depend only on starting and ending conditions and are State Functions.

Point function and path function are found in Thermodynamics.

This is the critical point.

difference between critical temp and boiling point

the temperature and pressure where the liquid state no longer exist is called the critical point