Adoration of the Blessed Sacrament is a form of worship and devotion to Jesus Christ, present in the consecrated host. Christians around the world have worshiped and prayed in this way for at least 750 years.
Catholics believe that during the Mass which we attend each week (for some of us daily), the priest (during the consecration) speaks these words as he holds the communion host, "...He took bread and gave you thanks. He broke the bread, gave it to his disciples, and said: Take this all of you, and eat it: this is my body which will be given up for you". When the priest says "this my body", it is at that instant when, through the miracle of transubstantiation, the bread and wine which we offer as the bloodless sacrifice to our Lord truly become the Body, Blood , Soul and Divinity of Jesus. It is His true Presence in the form of bread and wine. It is Christ.