Classical mechanics refers to the classical physics of bodies and forces, especially Newton's laws of motion and the principles of mechanics based on them
Thermodynamics is the branch of physics that deals with the relationships between heat, energy, and work and the laws of thermodynamics. These laws describe the behavior of energy and how it can be transferred between different forms or systems.
Electromagnetism is the study of the interactions between electrically charged particles and magnetic fields. It is a branch of physics that deals with the phenomena of electricity and magnetism as two sides of the same fundamental force.
Electronics is the branch of physics and engineering that deals with the behavior and manipulation of electrons and other charged particles in devices and systems. Some practical applications of electronics include computers, mobile phones, televisions, and various types of medical equipment.