I am not sure about this term "High Frequency Trading" but in crypto we call it day trading where people buy and sell on the same day and get some profits. Some people do trading with a program more specifically a bot who will keep track of the market and will trade automatically. A bot woks good in a steady market like stock but sometimes it is not useful in a volatile market such as crypto.
HFT doesn't involve human intervention after the algorithm was created, it is in a way an AI that does hundreds of thousands of trading which beats anything humanly possible trading. This is a better alternative to day trading because it buys the lowest price. Trading bots will work if the code behind it is really good, there are some equations that can be used for it so it can still trade efficiently in a volatile market. You should watch the video, I highly recommend it 
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