Here's a breakdown:

* Somatic cells: These are any cells in the body that are not involved in sexual reproduction (like skin cells or blood cells).

* Nuclear transfer: This involves taking the nucleus (which contains the genetic material) from a somatic cell and transferring it into an egg cell that has had its own nucleus removed.

* Cloning: The egg cell with the new nucleus is then stimulated to start dividing, developing into an embryo that is genetically identical to the donor of the somatic cell.

Here's why SCNT is the most common:

* It's the most successful method: It's the only method that has been used to create cloned mammals, including Dolly the sheep.

* Versatility: SCNT can be used to clone a variety of animals, including livestock, pets, and even endangered species.

Other methods of cloning:

* Artificial embryo twinning: This involves splitting an early embryo into two or more embryos, which then develop into genetically identical offspring.

* Gene cloning: This involves creating copies of specific genes, rather than entire organisms.

While SCNT is the most common, other methods are being explored and may become more prevalent in the future.