Protestants: What Is A Sacrament?

I was grew up with the understanding that the last supper/ munion was just to remember what he did that night with the 12. Now for me just going threw the baptism and our first untion as new members of the Catholic Church, I will have to say both were a spiritual awakening. On Thursday night foot washing my own feelings were, how humble I felt and took me back on what I would have done if Jesus washed my feet? All 7!!