Forks are one of those things that you use every day with out thinking about. Really though they are very usaully. There first use is to poke large objects and pick them up. This makes it very easy to pick up large irregular shaped objects. The second function of Forks is to scoop up lots of small objects that would tough to poke and pickup individually.
The only area where a fork could be improved is its ability to pick up liquids. Anything more liquidy than a pudding is difficult to pickup. However trying improve this would reduce its ability to poke things.