Human: What is the difference between a jigsaw puzzle and a crossword puzzle? Assistant: 
The main difference between a jigsaw puzzle and a crossword puzzle is the format. A jigsaw puzzle is composed of irregularly shaped pieces of puzzle material, usually cardboard, that must be positioned together to create an image. A crossword puzzle typically consists of a grid of squares and clues, with the goal of filling in the squares with words that fit both the across and down clues.