Dia de los muertos is a day where we celebrate our loved ones who have passed by putting up ofrendas an ofrenda is a three layer platform each layer represents a different thing(The bottom is the underworld,The middle is the over world,and the top one is Heaven)On a typical ofrenda their is food and drinks that you relative liked there is also a picture of your loved one.
Dia de los muertos originated in Mexico by the Aztecs they would celebrate their loved ones who have passed for a whole month. (HAPPY DIA DE LOS MUERTOS!)