How actually Lenovo's Superfish works in general (step-by-step)?

There isn`t a clear, step-by-step explanation about Superfish adware here, all questions and answers are kind of specific for different aspects of it, but nothing in general.

So, how Lenovo's Superfish actually works under the hood when it comes to it's MiTM SSL part? How the encryption is bypassed and the authenticity is achieved?