Your computer’s hosts file is a local DNS lookup table. When you type www.adobe.com , your PC checks this text file before asking the internet.
# Adobe Activation & Genuine Service 0.0.0.0 genuine.adobe.com 0.0.0.0 prod.adobegenuine.com 0.0.0.0 activate.adobe.com 0.0.0.0 licenses.adobe.com 0.0.0.0 lm.licenses.adobe.com adobe hosts file block list exclusive