Final answer:
A skeletal structure is a shorthand method of drawing organic molecules, using lines to represent carbon atoms and omitting hydrogen atoms attached to carbon atoms.
Step-by-step explanation:
A skeletal structure (also called a line-angle structure) is a shorthand method of drawing organic molecules. In this type of structure, carbon atoms are represented by the ends of lines and bends in between lines, while hydrogen atoms attached to the carbon atoms are not shown. Other atoms besides carbon and hydrogen are represented by their elemental symbols. For example, if the question is asking for the skeletal structure of a certain organic compound, one would draw the structure using lines to represent carbon atoms, and any hydrogen atoms attached to the carbon atoms would be omitted.