The internet has traditionally been built for humans, but today a massive new group of 'visitors' has arrived: AI agents and Large Language Models (LLMs).
When these AI systems visit a website, they normally get to see the heavy, complex HTML code. This is a waste, because HTML is full of styling and layout code that is completely irrelevant to a bot. It costs the AI an unnecessary amount of computing power (so-called 'tokens') to extract the actual text from all that code.