The nature of particles and matter in reality is a complex and debated topic in physics. The viewpoint you mentioned is rooted in certain interpretations of quantum field theory (QFT), which describes fundamental particles as excitations of underlying quantum fields. According to this perspective, particles are not truly fundamental entities but rather manifestations or fluctuations of these fields.
In quantum field theory, particles are treated as excitations or quanta of their respective fields. For example, the photon is associated with the electromagnetic field, the electron with the electron field, and so on. These fields pervade all of space and time and interact with each other. According to this framework, the behavior and properties of particles are described by the interactions and dynamics of the underlying quantum fields.
However, it is essential to note that while this interpretation is widely accepted in modern physics, it is still a theoretical framework that represents our current understanding of nature. It is based on experimental evidence and has been remarkably successful in predicting and explaining a wide range of phenomena. Nonetheless, it is an ongoing area of research, and our understanding of fundamental particles and their nature continues to evolve.
Ultimately, the true nature of particles and matter is a subject of ongoing investigation, and scientists are continuously exploring and refining our understanding through theoretical and experimental studies.