system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What’s the difference between jelly and jam?
gpt
Jelly is a gelatinous spread produced from fruit juice. 

Jam is a a gelatinous spread produced from pureed fruit.

Preserves is a gelatinous spread produced from pureed and smashed fruit having chunks of fruit in it. 

Marmalade is a specific kind of Preserves made from citrus fruit involving a significant amount of the zest of the fruit.