'Bareboat' is the nautical equivalent of 'trekking without a guide'. A bareboat yacht charter (yacht rental without professional skipper) means that you will skipper the yacht with some help from your crew and you will be the person in charge. Upon your arrival you will have to deliver the yacht (check-in) and it's equipment.
From this moment and until the return of the yacht to the base, you remain responsible at sea or in port. Bareboats do best when there is some role in the team.