Solid core and stranded core cables are types of UTP cables, with solid core UTP each wire uses a single solid wire while with stranded core each wire is a bundle of tinny wire strands. Solid core is a better conductor but will break if handled too often or too roughly because it is stiff.
A stranded core is not quite a good conductor, but it will not break if handled roughly or too often. They are made using a collection of thin wires that are bound together to function as a single line. It is more expensive to make, and they are ideal for cramped spaces and areas like vibrating machinery.
The stranded cable also has higher attenuation which makes it better for short-distance runs and it is vulnerable to electrical interference because it has multiple wires instead of a single line. I think solid is more common than stranded because it is less expensive.
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