But what is a Neural Network?

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Grant Sanderson's legendary visual explanation of neural networks, hosted on his 3Blue1Brown YouTube channel. Uses beautiful animations to walk through how a neural network actually recognizes a handwritten digit, what gradient descent looks like geometrically, and what backpropagation is doing under the hood. This is the single best free resource on the internet for building genuine intuition about how AI works at a mechanical level. The videos demand some patience and a willingness to think — they're not "AI for breakfast" content — but if you put the time in, you'll come away understanding more than most people who've taken a full course. Best for visual learners, students considering a deeper technical track, and curious adults who want to know what's actually happening inside ChatGPT.

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