That would be a port, or port complex.
Container ships are some of the largest ships to cross the oceans. The function is to transport goods from one location to another. The reason containers are used is because the containers can be loaded and unloaded extremely efficiently and shipped with relative ease.
port
Triangular trade worked like this. Ships loaded with merchant goods, like guns, rum, clothing etc. sailed to Africa from Europe. There the merchant goods were traded for slaves. The ship loaded with slaves in middle passage sailed for the Americas and traded the slaves for raw materials like cotton, tobacco, pineapples and coffee. The ships then sailed for Europe and the process was begun again.
Quay
Dock
port
Loaded his ships
The willy platform
in a crate
Goods are sent on cargo ships across seas because it is the most economical means of transport.
Transportation of goods by ships is called cargo shipping. For this purpose huge vessels are deployed.