What is a crusade and where in the world holy land?

A crusade is a religious military expedition undertaken by Christian warriors in the Middle Ages to recover the Holy Land from Muslim control. The Crusades were launched in response to the Seljuk Turks' capture of Jerusalem in 1071, which cut off Christian pilgrims from the city.

Holy Land:

The Holy Land is a term used to refer to the region of the Middle East that is significant in Christianity. It includes the lands of Israel, Palestine, Jordan, Syria, and Lebanon. The Holy Land is home to many important Christian sites, including the Church of the Holy Sepulchre, the traditional site of Jesus' crucifixion and resurrection, and the Mount of Olives, where Jesus ascended into heaven.