The noun presentation means the official giving, or presenting, of something. The presentation of diplomas at a graduation ceremony is the part that makes many of the parents in the audience cry.
A presentation can be a ceremony of giving some gift or award, and it can also be a demonstration or show — like a dog training presentation at your local pet store. Another meaning of presentation is a style of displaying something — like the presentation of plants and flowers in the florist's window or the presentation of food on a buffet table. In the 1600s, presentation was commonly used to mean "show or play," as in "a theatrical presentation."