I am a ship that can be made to ride the greatest waves

I am a ship that can be made to ride the greatest waves

I am a ship that can be made to ride the greatest waves

Riddle me this:

I am a ship that can be made to ride the greatest

I am a ship that can be made to ride the greatest waves. I am not built by objects, but built by minds.

What am I?

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ANSWER

Friendship.