Point defects in an ideal crystal lattice are called defects that arise as a result of the replacement of an intrinsic atom with an alien one, the introduction of an atom into an interstice, the absence of an atom in one of the nodes of the crystal lattice. Disturbances in the order of arrangement of atomic planes in a crystal are called dislocations.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.