GitHub Copilot watches what you type and suggests code completions—sometimes full functions—drawn from patterns in billions of lines of public code. It runs inside your editor as you work, functioning as a faster autocomplete on steroids. The core tension: it genuinely accelerates routine work and reduces boilerplate, but the suggestions are probabilistic, not guaranteed correct, and you're feeding GitHub training data on your coding patterns. Pricing starts at $10/month for individuals, $19/month for enterprise, with a limited free tier. The privacy trade-off—that your code trains the model—remains the honest catch most teams grapple with.