What is the difference between a single-core and multi-core cable?

There are quite some differences between single and multi-core cables. Here are some: 

• Conductor: A single-core cable has only one conductor, whereas a multi-core has multiple conductors. Each conductor is insulated and can carry a different electrical power. 
• Size: Single-core cables are slightly larger in size than multi-core cables. 
• Installation: Single-core cables are generally easier to install than multi-core cables.