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Yes, copper pipes are used extensively in plumbing.
cc means a close coupled ie a toilet pan and cistern which are attached to each other by bolts and a washer cc can also mean copper to copper... ie: sweated / soldered connection.
There is no universal connection for plumbing, every country is different, some countries use copper, while others use materials such as galvanised, plastic, stainless steel and brass, which all come with their own connecting devices.
NO, a garden hose only requires one connection and can be connected with with water flowing
Copper
When it comes to a plumbing fitting, description CxC means the fitting is Copper by Copper, or the fitting is used to join two pieces of copper
Copper tube is a favorite choice for plumbing, heating, cooling and other systems. Copper tube is most often used for supply of hot and cold tap water as refrigerant line in HVAC systems. There are two basic types of copper tube, soft copper and rigid copper. Copper tubing is joined using flare connection, compression connection, or solder. Copper offers a high level of corrosion resistance, but is becoming very costly. alliedallcityinc.com
it is used for plumbing
It is a copper pipe used in plumbing.
They used lead and clay plumbing in ancient Egypt.
I am a Plumbing/HVAC Contractor and the type of fitting I always used for underground copper service pipe has been 3/4" (standard size for residential) brass flared fittings. A flared connection is a tight, secure connection guaranteed not to leak.
Copper is NOT good for plumbing. It was once, when there was no alternative. Now many superior products like PEX are available. They are cheaper, more lasting and more efficient to fit than copper.