Top left image (see here) crumbs from a Host turns to blood on altar at Little Audrey Santo's Home. Bottom left image (see here) bleeding Hosts from Little Audrey Santo's Home. Right image (see here) is a Host that bled in Guadalajara, Jalisco, Mexico.
A Eucharistic Miracle is any miracle associated with the Eucharist.
The Eucharist (also called Holy Communion, the Lord's Supper) is a rite considered by most Christian churches to be a sacrament. According to the New Testament books, it was instituted by Jesus Christ during his Last Supper. Giving his disciples bread and wine during the Passover meal, Jesus spoke to his followers. This bread is my body. This wine is my blood. Every time you eat this bread and drink this wine in my name, I will be present with you.