Refers to a ferry boat or ferry service, used in the same way as the English word.
明日、フェリーで島に渡ります。
Tomorrow I'll cross to the island by ferry.
この港からフェリーが出ています。
Ferries depart from this port.
We boarded the ferry at the port.
We crossed to the island by ferry.
The next ferry departs at 3 p.m.
Many tourists take the ferry to get to the island.