Dinner Fork: 

•  This worked beautifully for things like meat. 
• However, it doesn't work so well with peas or corn or such. 
• More tines were added to make it easier to capture a variety of things from meat to legumes to vegetables. 

Salad Fork: 

• Same general idea of a dinner fork but it's a bit smaller and the tines are shorter. 
• See, there is some method to the madness. 
• Here's the rule on salad forks: if your main course is a salad or if your salad is served as a side dish to your entrée, use your dinner fork. 

Seafood Fork: 

• The purpose of a seafood fork is to spear seafood served in a compote or a shell, such as shrimp cocktail or coquille St. Jacques.
• The seafood fork is used in formal and informal dining

Beef Fork: 

• A fork used specifically for picking up thin slices of meat
•  It's shaped like a regular fork but it's bigger and the tines are curved outward.