IUI or Intrauterine insemination is a simple procedure where the processed sperm sample is placed inside the uterine cavity.
Usually we advise trying 3-6 cycles of IUI as most conceptions would be expected to occur within this time frame.
IVF or In vitro fertilization is a procedure where the eggs of the female partner are incubated with the sperm sample in a laboratory dish and fertilization is allowed to happen.