das Tau
rope
A very thick and strong rope used especially in shipping, climbing, or for securing heavy loads.
Das Schiff wurde mit einem dicken Tau am Pier festgemacht.
The ship was secured to the pier with a thick rope.

rope
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rope
A very thick and strong rope used especially in shipping, climbing, or for securing heavy loads.
Das Schiff wurde mit einem dicken Tau am Pier festgemacht.
The ship was secured to the pier with a thick rope.

The article is crucial with this word. 'Das Tau' (neuter) is the thick rope. There is also 'der Tau' (masculine), which means the moisture in the morning (dew).
Die Bergsteiger sicherten sich mit einem Tau.
The climbers secured themselves with a rope.
In the field of shipping, there are fixed expressions with 'Tau' (rope). You can 'die Taue loswerfen' (cast off the ropes, to depart) or 'mit Tauen festmachen' (secure with ropes, to dock) a ship.
Der Kapitän gab den Befehl, die Taue loszuwerfen.
The captain gave the order to cast off the ropes.
Since a rope has to be very sturdy, it is often described with adjectives such as 'dick' (thick), 'stark' (strong), or 'reißfest' (tear-resistant).
Für diese schwere Last brauchen wir ein besonders reißfestes Tau.
For this heavy load, we need an especially tear-resistant rope.
cable
'das Kabel' and 'das Tau' can both refer to something very thick and strong that is used to hold or secure heavy things. 'Tau' is a very thick rope and fits especially well with ships, climbing, or securing heavy loads. 'Kabel' here usually means a strong technical cable, often made of steel, for example on a bridge or a machine. 'Tau' sounds more like a rope made of fibers or something connected with shipping, while 'Kabel' sounds more technical and metal-related.

Am Hafen macht der Matrose das Boot mit einem Tau fest.
At the harbor, the sailor ties up the boat with a rope.
Ein dickes Kabel aus Stahl zieht den Aufzug nach oben.
A thick steel cable pulls the elevator upward.