This is a notes prepared by Laser sales and application Engineer, based on his 18 years of experience in sales and application training of various laser machines available in the market. This is not a book or journal, it is only an info notes prepared based on understanding the laser science from various company materials, books, research papers and also assumptions made from understanding. This has two sections, Section-1 is the basics of laser hair removal, the logic of the treatment parameter chart, and Section 2 provides information on various technologies of hair removal with comparison, the Latest advancements in hair removal laser technology, treatment form, guidelines for choosing right laser parameter &guidelines to do good treatment, and also about guidelines to select best laser hair removal machine. All the information discussed is based on the machines/technologies available in the market, not based on any particular brand or Laser model. Under the topic of selection of laser hair removal machine, you may get guidelines in evaluating & choosing the right Laser machine that suits your requirement.