Every time you type a search query into Google, an invisible brain is working behind the scenes to figure out what you actually mean — not just the words you typed, but the intent behind them. That brain is called BERT, and this episode explains how it works, why it was revolutionary, and what it means for the future of artificial intelligence.

BERT — Bidirectional Encoder Representations from Transformers — was a 2018 breakthrough from Google AI that fundamentally changed how machines process human language. Before BERT, language models read text in one direction, left to right or right to left, which meant they often missed crucial context. BERT's key innovation was reading in both directions simultaneously, allowing it to understand that the word "bank" means something completely different in "river bank" versus "bank account."