What are the differences between Hatha and Iyengar Yoga?

Hatha yoga is the traditional way of yoga and Iyengar yoga we can say is the form that has been cake out of hatha yoga ...... Iyengar yoga is basically done by using various yoga equipment ,like block chair and all...but in hatha these things are no used much ...buy Iyengar is totally depends in equipments

Hatha yoga is basic form of yoga, which covers lots of asanas from easy to hard, and perform without any equipments.

Whereas, Iyenger yoga is as same asanas as hatha yoga but it perform with the help of props and equipment to make is more simple and easy for all age group and to generate interest in yoga with minimal efforts. 

One can start their yoga journey with hatha yoga or Iyenger yoga. 

Iyengar yoga is an alignment based type of yoga. It is rooted in hatha yoga but Iyengar yoga has a much more thorough approach to the poses. Props are used a lot in Iyengar yoga to support you in the poses and assure that you find the correct alignment and therefore reap the full benefits in the poses.

BKS Iyengar, founder of Iyengar yoga, himself is the best-known exponent of Hatha Yoga. Hatha Yoga is the most traditional form of yoga practice, involving asanas, pranayama, dhyana (includes kriyas, mudras, bandhas) and the Hatha Yoga Pradipika by Swami Swatmarama is considered the first widespread text to have coded this. Popularly, the Hatha Yoga is a practice of yoga that involves exploring poses with a focus on staying in the poses and gently staying aware of your body and breathing.

B. K. S. Iyengar innovated on this form (and in my guess - in an attempt to make yoga more reachable to people of various ages and interests) and introduced several props to help people achieve difficult poses with support. Iyengar yoga makes it possible for people to derive benefit from poses that would not be possible in traditional Hatha yoga through the use of several props.