Cranberry Sauce and Cranberry Jam are made with the same cranberries but are made differently.
Both cranberry sauce and cranberry jam are in some ways the same thing but in different forms.
The main difference between cranberry jam and cranberry sauce is in the pectin.
Cranberry sauce can be served as a gooey liquid or Jelly.
Cranberry Jam is more like other jams that you put on toast and some people prefer to put cranberry jam on toast and pancakes just like a peanut butter and jam sandwich.
Cranberry sauce is a different form and mostly served along with turkey, ham etc for Thanksgiving and Christmas.
Some people warm up canned cranberry sauce and some people just serve the canned cranberry sauce cold or at room temperature right out of the can.
You can serve the canned cranberry sauce either way.
My mom would warm up canned cranberry sauce before she served it and my Grandma always served the canned cranberry sauce cold.
It's all up to you and is a personal preference.
If you prefer the canned cranberry sauce warm then warm it up but if not you can serve it cold or at room temperature.
Cranberry sauce is usually served cold or chilled.
But if you want to heat the cranberry sauce up you can do so.
I like my cranberry sauce heated up so that it's warm but not too hot as it tastes better than being chilled or served cold.
However I do sometimes like to make cranberry sauce sandwiches by placing cold cranberry sauce out of the can onto some bread and eat it that way.
But when you eat cranberry sauce for Christmas or Thanksgiving dinner it's traditionally served cold or chilled but it's okay to eat it warmed up if that's the way you prefer it.