It is the simplest form of Hajj. A pilgrim enters into the state of Ihram with the intention of performing Hajj only before passing through the Meeqat (place for assuming ihram). The pilgrim does not combine Hajj with Umrah and makes sure not to perform umrah in the months of Hajj. The person performing Hajj-ul-Ifrad is called Mufrid.
During this kind of Hajj, a pilgrim who performs Hajj-ul-Qiran combines Hajj and Umrah. He assumes Ihram with the intention to accomplish both.
The pilgrim who performs this kind of Hajj is called a Qarin.
Qarin wears Ihram first for Umrah and then for Hajj making his intentions for Hajj just before performing Tawaf for Hajj. The obligations on one performing Hajj-ul-Qiran are the same as the one performing Ifrad, except that the former must slaughter whereas the latter is not obligated to do so.
In this type of Hajj, a pilgrim assumes Ihram for only Umrah during the months of Hajj. After reaching Makkah, he performs Tawaf
and Saa'ee for Umrah. He then performs Qasr i.e. shaves or clips his hair. On the day of eighth of Dhul-Hijjah, he puts on his Ihram
for Hajj and performs the rites and duties of Hajj. The person who performs this kind of Hajj is called a Mutamatti.
All the forms of Hajj are rewarded but the most recommended form of Hajj by Prophet Muhammad (pbuh) is Hajj-ul-Tamattu and he encouraged his followers to perform it. Even if a pilgrim forms niyyah to perform Qiran or Ifraad he is allowed to change it to perform Tamattu.