I can’t say I’ve ever seen the Windows registry explained well. It helps to think of the registry as a database. Microsoft loves databases, and they’ve been trying for decades to stuff as much database technology into Windows as they can. The registry was one of the earliest and most successful of those efforts.
Although it was controversial in the 1990s, the registry solved a very real problem. Windows 3.1 and earlier stored all of its settings in huge plaintext files called ini files. They were a tangled mess, and the more you used your computer, the slower it became. The registry made it a lot faster for the computer to find each setting it needed.
David Farquhar is a computer security professional, entrepreneur, and author. He has written professionally about computers since 1991, so he was writing about retro computers when they were still new. He has been working in IT professionally since 1994 and has specialized in vulnerability management since 2013. He holds Security+ and CISSP certifications. Today he blogs five times a week, mostly about retro computers and retro gaming covering the time period from 1975 to 2000.
