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Fact #1. We've been waterproofing for a very long time. Most archaeologists agree that waterproofing developed during the First Agricultural Revolution. Farmers needed a reliable way to control water. The channels through which they did so wouldn't be as effective if they were prone to leaks.
Fact #2. As mankind became more active on the sea, ships would undergo various forms of waterproofing to shore up their hulls. Egyptian tombs also underwent a similar form of waterproofing known as bitumen emulsion. This process involved spreading thick layers of black goo among dry reed fibers laid out in cross patterns. Despite the annual flooding of the Nile River, the interior of the Great Pyramids went untouched by water for millennia.
Fact #3. Waterproofing a piece of clothing is very different from waterproofing a watch or a camera. Electronic waterproofing relies on a combination of waterproofing treatments and rubber seals. A jacket, on the other hand, simply has to be treated with the necessary chemicals to form a seal at every point on the exterior of its shell.
Fact #4. If you're in the market for a waterproof jacket, the odds are that you're headed to someplace wet. The most important thing you should consider about your moist environment is the average temperature. If you're headed somewhere that's both wet and tropical, you'll want a lightweight jacket. If the jacket boasts both waterproofing and breathability, you can rely on it to keep you both dry and cool.
Fact #5. If you're headed to Seattle or London in the winter, you can expect all that moisture to be considerably cold. That means you'll want a heavier jacket. In those particular places, rain often gives way to a kind of mist. If this mist gets fine enough, it can permeate that breathable barrier on lighter jackets.