A spontaneous vaginal delivery (SVD) occurs when a pregnant woman goes into labor with or without use of drugs or techniques to induce labor, and delivers her baby in the normal manner, without forcep...

A spontaneous vaginal delivery (SVD) occurs when a pregnant woman
goes into labor with or without use of drugs or techniques to induce
labor, and delivers her baby in the normal manner, without forceps,
vacuum extraction, or a cesarean section.

Assisted vaginal
delivery (AVD) occurs when a pregnant woman goes into labor with or
without the use of drugs or techniques to induce labor, and requires
the use of special instruments such as forceps or a vacuum extractor
to deliver her baby vaginally.