Clones and twins are similar but not the same. When a sheep is cloned, DNA, the material in cells that makes living things different, is removed from a cell and is placed inside of an egg. The egg matures and develops into a lamb. Twins, on the other hand, originate from the same egg. Instead of taking the DNA from one egg and placing it into another, the original egg splits into two before maturing into two lambs.
Companies generally test a product themselves first, then invite a few other people to test it.
This is beta testing. Beta testing helps companies find out which problems need addressing before releasing that product to the public.