Basically the same as classical mechanics.
The idea tha taking the limit of the non-classical theories for certain parameters (relativity and quantum mechanics) should lead to the classical theory.
It appears that classical limit is only very strict for relativity. For quantum mechanics it is much more hand-wavy thing. See also: Subtle is the Lord by Abraham Pais (1982) page 55.
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Classical physics refers to the branch of physics that deals with the fundamental principles and laws governing the behavior of matter and energy in classical (non-quantum) systems. It encompasses a variety of theories and concepts developed prior to the 20th century, and it includes several key areas: 1. **Mechanics**: This is the study of motion and the forces that cause motion. Classical mechanics describes the motion of objects and is based on Newton's laws of motion.