Raihan Lutfianto

Hi Aditya. A great question there. The first step is to think about the physics of them. The main differences between them are the MAGNITUDE of load and the DIRECTION of application.

Please take a look at this video Understanding the Difference Between Forces and Pressures Using Ansys Mechanical — Lesson 4 - YouTube

To answer your last question, we may consider using Force when we would like to model force acting on one part caused by other parts (generally the parts are not modeled). We can use pressure to model loads caused by fluids (assuming there is no shear forces by fluid)