Copper tubing is like a straw that is made out of a special metal called copper. This metal is really good at conducting electricity and heat, which means it can be used to carry electricity and hot or cold liquids around your house.
Think about when you drink juice or milk from a straw. You can suck up the liquid and it travels all the way to your mouth. Copper tubing is similar, but instead of juice, it carries things like hot water for your shower or cold water for your drinking fountain.
The copper tubing is made by taking a long piece of copper and bending it into a straw-like shape. Sometimes it is really long and straight, and other times it is coiled up like a spring. The tubing is then connected to other tubes to make a network of pipes that can carry the liquids all over your house or building.
Since copper is really good at conducting heat and electricity, it is used in many different things besides tubing. For example, you might find it in the electrical wires that run through your walls, or even in the pennies you have in your piggy bank!