WHAT IS IT? - a boat or ship for taking passengers and often vehicles across an area of water, especially as a regular service.

WHAT IS IT? - to go across from one side of something to the other.

WHAT IS IT? - a town by the sea or by a river that has a harbor, or the harbor itself.

WHAT IS IT? - a line of people, usually standing or in cars, waiting for something, or a lot of people who want something.

WHAT IS IT? - to get onto or allow people to get onto a boat, train, or aircraft.

WHAT IS IT? - a person who is traveling in a vehicle but is not driving it, flying it, or working on it.

WHAT IS IT? - the fact of a person or vehicle, etc. leaving somewhere.

WHAT IS IT? - protection of a person, building, organization, or country against threats such as crime or attacks by foreign countries.

WHAT IS IT? - happening at a later time than expected, or happening some time after the event that caused it.

WHAT IS IT? - suitable for your purposes and needs and causing the least difficulty.

WHAT IS IT? - to show your ticket at an airport so that you can be told where you will be sitting and so that your bags can be put on the aircraft.

WHAT IS IT? - a part of an airport where travelers are allowed to get on or off a particular aircraft.

WHAT IS IT? - a covered space at the back of a car, for storing things in.