Jesus took bread, and blessed it, and brake it, and gave it to the disciples.
Just before the Lord was taken and crucified, He wanted His disciples to be reminded of Him in His death for them. So He instituted a simple remembrance for that purpose. First He took a loaf of bread and, after breaking it, He gave it to them to eat as a reminder of His body given in death on the cross. After this they drank from a vessel of wine in remembrance of His blood shed on the cross. This is so simple, yet so full of meaning to those who are truly saved.