a sweep is not really indcution
a sweep is a way to try to kickstart labour,, the mw introduces a finger tip into the cervix, to strip the membranes away from the inside of the cervix...and this also irritates the cervix, and the stripping releases the hormones that can cause you to contract.....but you can go home afterwards, and it will only work if you would have gone into labour within 24 - 48 hours..so not a surefire way of starting labour
an indcution is actually starting labour...either with breaking the waters, or using a gel of synthetic hormones ( prostin....which is the synthetic version of prostoglandin, present in semen, which is why sex can help get labour started....) as it ripens the cervix. causing it to soften and dilate. this has to be done in hospital, and you stay there once the gel is applied. same with having waters broken.
if neither of these methods start contractions, or contractiosn not deemed to be efficient enough, labour is agumented ( strenghtened) with a drip of a synthetic hormone, syntocinon...which is a version of naturally released oxytocin...which is released by orgasm, and nipple stimulation.
induction guarantees that you will be made to go into labour...a sweep does not. induction can be unpredictable, taking hours or days