A bobby pin  is a type of hairpin used to to hold hair in place like up-dos, buns, and other hair styles where a sleek look is desired.
A bobby pin (also known as a kirby grip or hair grip in the United Kingdom) is a type of hairpin, usually of metal or plastic, used in coiffure to hold hair in place. The main use of a bobby pin is to hold hair in place. In addition to bobbed hair, bobby pins are often used in up-dos, buns, and other hair styles where a sleek look is desired. 
