Okay, picture it like this:
Think of all the different things that happen in the world. There are things that are done, like cooking dinner or building a sandcastle. There are things that happen naturally, like the wind blowing or the sun rising.
Now, imagine putting all of those things into categories. The things that are done can go in one category, and the natural things can go in another category.
But here's where it gets tricky: each thing that happens or is done is made up of lots of little steps or actions. So, making dinner involves things like chopping vegetables, boiling water, and stirring soup. Building a sandcastle involves things like shaping sand into towers and digging a moat.
Those little steps and actions are just as important to understanding what's happening as the bigger categories they fit into.
That's what process ontology is all about: looking at the world as a bunch of different processes or actions, and understanding how those processes are made up of lots of smaller steps. By studying processes in this way, scientists and philosophers can gain a deeper understanding of how the world works and how things change over time.