Shellac - is a blend of gel and nail polish. Because it is like a polish, it can’t be used to extend your nail. Because it is like a gel, however, it does add strength and durability. The main benefit is that it reduces chipping.
Acrylics and Gels - are artificial nails placed over your natural ones. Both can be made to match the shape of the nail, or to extend it. So, when you want longer nails, you are asking for either Acrylic or Gel extensions. People get Acrylics and Gels in order to have stronger nails.
Manicure - a cosmetic treatment of the hands involving cutting, shaping, and painting of the nails, removal of the cuticles, and softening of the skin.
Pedicure - Professional care and treatment of the feet, as removal of corns and trimming of toenails