Prayer and meditation before our Lord in the Blessed Sacrament are great ways to spend some special time with Him. You can ask Him for graces for yourself or for loved ones, reflect on His Word, or just keep Him company! And it’s no bother for Jesus. In fact, He very much wants to see you
We as Catholics believe that at Mass bread and wine truly become the body, blood, soul and divinity of our Lord Jesus Christ, during the Consecration by the priest. The consecrated bread, the Eucharist, in the form of wafers we call hosts, becomes what is known as the Blessed Sacrament.
Jesus appears to us at that point in the form of bread and wine. Yet, as we believe following the doctrine of what is called the Real Presence, our Lord is as present to us here as He was to his apostles in Palestine 2000 years ago!
(from:http://www.ourcatholicprayers.com/blessed-sacrament.html)