Process Physics, put forth by Reg Cahill, is a theoretical framework that seeks to explain the fundamental nature of reality based on the concept of process. It proposes that the universe is composed of processes rather than objects or particles. According to Cahill, processes are the fundamental entities that give rise to the observed phenomena in the universe.

In Process Physics, space and time are not considered fundamental, but rather emerge from the interplay of underlying processes. These processes involve information exchange and computation-like interactions. The framework suggests that the behavior and evolution of the universe can be understood in terms of the dynamic interplay of these processes.

While Process Physics incorporates elements of information processing and computation, it differs from digital physics in some key aspects. Digital physics focuses on describing the universe as a computational system, while Process Physics emphasizes the primacy of processes and their interactions. It suggests that computation arises as an emergent property of these processes rather than being the fundamental nature of reality.

Process Physics also differs from the simulation hypothesis. It does not propose that the universe is a computer simulation created by an external entity. Instead, it focuses on the intrinsic nature of processes and their interactions, without invoking the concept of a simulated reality.

It's worth noting that Process Physics is a theoretical framework that is still being developed and explored. Its ideas and implications continue to be studied and evaluated within the scientific community.
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