H-1B1 Specialty Occupation (Professionals)
H-1B2 U.S. Department of Defense special visas
H-1B3 Artists, entertainers or fashion models of national or international acclaim
H-1B4 Artists or Entertainers in unique or traditional art form
H-1B5 Athletes
H-1BS Essential support personnel for H-1B entertainer or athlete.
most ppl apply for H1B1 ( ppl often H1, it is not completely correct)