Our great JURISPRUDENTS, have classified the pilgrimage in three kinds or classes:
A- INTERRUPTED PILGRIMAGE, which is called HAJJ-Al-TAMATOA. It is the formal pilgrimage of which the chief rites are during the first ten days of the month of ZUL-HAJJ. It is for those who live at a distance no less than 48 miles from Mecca.
B- The COMBINED PILGRIMAGE, known as HAJJ-AL-GHERAN in Arabic.
C- And the SINGLE PILGRIMAGE called, HAJJ-ALAFRAD.
The latter two are for those who live within a distance less than 48 miles from Mecca.
There is also the Lesser Pilgrimage (UMREH), which is a less formal pilgrimage that can be performed at any time of the year; and of course it is performed by those who are far from Mecca. As for the residents of Mecca the question of UMREH does not arise, for they are there in the sacred town all the time.
In the Interrupted Pilgrimage, first the rites of UMREH are performed, then the pilgrims come out of their Garbs.
After that they perform the chief rites of HAJJ, in the appointed days. But in the Combined and Single pilgrimage, first the rites of HAJJ are performed, and then the rites of UMREH.
In the Combined Pilgrimage an animal has to be sacrified but for the Single Pilgrimage the sacrifice is not necessary.