What is pilgrimages or pilgrims?

'Pilgrim(s)' are a person or a group of people who are making a journey somewhere for religious purposes. The 'pilgrimage' refers to the journey they make.

For Muslims the 'pilgrimage' would be the Hajj and the 'pilgrims' would be those Muslims making the Hajj that year.

For Christians the 'pilgrimage' may be a trip to the Holy Land (Jerusalem) and the 'pilgrims' are the people making the visit.