Ever wondered where 90GB of data “disappears” when you ZIP a file? 🤔 I used to think compression was magic until I learned what actually happens inside that .zip file. Your 100GB folder becomes 10GB in seconds, but here’s the thing - not a single bit is deleted. ZIP uses 2 brilliant algorithms working together: 1. LZ77 - Finds repeated patterns in your data. Instead of writing “Machine Learning” 500 times, it creates a dictionary: 1 = “Machine Learning” and just writes 1 everywhere. One phrase