"When the United Airline stock price rises, buy some Airbnb stock." This type of algorithm-driven trading monitors certain trends in the market and executes trading strategies instantly.
Low Code platforms such as Alpaca came around a few years ago, making it easy for developers to obtain market data and focus on developing and testing algorithms. However, the entry barrier is still high; you still need to know how to code.
Now, with the drag-and-drop UI of Streak, Tradetron, and Composer (beta), anyone can come up with their own algorithm-based investment strategies to be executed automatically.