ship
The German word 'Schiff' is the equivalent of the English word 'ship'. It is used to refer to a large seagoing vessel. Like in English, it can also be used in a metaphorical sense, for example, in the context of a spaceship.
I like to travel by ship.
This sentence indicates the speaker's preference for traveling by ship. The definite article 'dem' is used with the noun 'Schiff', which indicates 'the ship'. In such a context, 'mit' is used to mean 'by' when referring to a mode of transport.
The ship is very big.
This is a simple statement that describes the size of the ship using the adjective 'groß' which translates as 'big'. The definite article 'das' corresponds to 'the' in English and agrees with 'Schiff' that is a neutral noun.
The ship is heading to Germany.
The sentence describes a ship's direction, heading towards Germany. Here 'fährt nach' can be translated as 'is heading to', and it is commonly used with the names of destinations to imply direction. 'Deutschland' is the German name for Germany.