To get real silk you have to raise millions of silkworms, allow them to spin cocoons, then kill most of them (retaining just enough live cocoons to produce the moths that will lay the eggs for the next batch of silkworms) and carefully unwind the silk fibers from these cocoons.
Silk thread is then spun from the harvested silk fibers.
All of these steps are performed manually by human labor.
To get synthetic silk (e.g. rayon, nylon) you just make a large batch of the appropriate polymer and extrude it through tiny nozzles and the resulting fibers are spun into thread.
These steps can easily be automated on a massive industrial scale, requiring almost no attention from humans.
The technology is simpler and the production is higher.
Artificial silk is produced in mills and with synthetic fibres. Original silk is produced by the silk worms and it requires a lot of skill, labour and time. SO naturally the original silk is expensive than the artificial.
Artificial silk is produced in mills with synthetic fibres. Original silk is produced by silk worms and it requires a lot of skill labour and time. They also have to take care of the worm, maintain its habitat and feed it.
Japan has developed technology for producing a synthetic spider silk with the same qualities as natural spider silk. Not all synthetic silk has the same qualities as the natural silk though.
It really depends on brand (fit, quality, name) and the sellers (silk undergarments are a lot cheaper in countries where silk is produced in abundance as opposed to countries that import, such as for example, Canada). When it comes to garments, prices vary enormously.
because it was made by artificially by human
People with a lot of money. So probably emperors would wear silk garments but not peasants.
Whether there is a 'need' or not, synthetic fibres often possess certain qualities that natural fibres do not. There may also be economic/social reasons why synthetic fibres are produced. Nylon, for example, was invented as a substitute for silk. It is far cheaper to produce and has superior qualities such as in the manufacture of parachutes. The days of silk parachutes have long gone, sad but true. But think of all those happy silk-worms!
Silk garments/clothes drape around perfectly and it keeps the body warm. The texture of a silk fabric is smooth and is like our skin. Silk garments give us a luxurious feeling when worn so it is quite popular.
Silk garments, tea and spices, jewellery.
Synthetic fibers were developed as an imitation of silk because silk was a luxurious and expensive natural fiber. By creating synthetic fibers that mimicked the properties of silk, such as shine and softness, at a lower cost, more people could afford fabrics with similar qualities. Additionally, synthetic fibers have the advantage of being more durable and versatile than natural silk.
Natural. It is the fiber made by the silkworm to surround the cocoon of the silk worm larva.