Despite all the wireless technology out there today, many networks still rely on cables to transfer data. In fact, there are cables stretched, strung and buried all across the world. There are even fiber optic cables running along the bottom of the Atlantic Ocean. But there are different types of cables, each with different strengths, weaknesses and applications. Here are the key cables you're likely to find tangled under your computer desk. (And if you want to read more about that trans-Atlantic cable, check out Trans-Atlantic Cable: The Real Infrastructure of the Internet.)