What are jigsaw puzzles?

A jigsaw puzzle is an assembly of small tiles designed to interlock and form a picture or three-dimensional structure when completed, states About.com. The pieces may be wooden, metallic, rubber or foam.

Jigsaw puzzles vary in complexity; the complexity of the puzzle increases with the number of pieces. Easy puzzles for toddlers may comprise as few as three pieces. Flat puzzles typically result in photographs or paintings when assembled. Three-dimensional jigsaw puzzles replicate unusual shapes, famous buildings and boxes. Jigsaw puzzles are primarily used as educational tools for children, but they are also popular among adults. Jigsaw puzzles are also available as computer games to play online or to download for offline use.