In Austria some people leave bread, water and a lighted lamp on the table before going to bed. It is believed that this will welcome dead souls back to Earth.
More than a thousand years ago the Christian church named November 1 All Saints Day (also called All Hallows.) This was a special holy day to honor the saints and other people who died for their religion. The night before All Hallows was called Hallows Eve. Later the name was changed to Halloween.
The origin of the festival is disputed, and there are both pagan and Christian practices that have evolved into what Halloween is like today.