Artificial intelligence is an extremely broad and deep field -- the applications are so numerous, and the tools so varied, that it can be tough to wrap one's arms around, let alone figure out which companies will benefit the most from it. And the average retail investor may not have the time or inclination to dive into the minutia of algorithms, machine learning, deep learning, computer vision, and inference. Yet the rapidly growing AI market will create an estimated $3.9 trillion in business value by 2022, so it's not a space that smart tech investors can ignore. The good news is that many of the technology companies doing big things in AI are already household names, and you don't need a computer science degree to grasp the basics of how they're using artificial intelligence to improve their businesses. If you want your portfolio to have more exposure to the AI market, but aren't sure where to begin, all you need to do is take a look at what Alphabet (NASDAQ:GOOG) (NASDAQ:GOOGL), NVIDIA (NASDAQ:NVDA), Microsoft (NASDAQ:MSFT) and Amazon (NASDAQ:AMZN) are doing in the space, and just pick one.