A geographic location where cloud providers have data centers. Like different cities where a company has branch offices - you choose the one closest to your customers.
AWS has regions like US East (Virginia), Europe (Ireland), and Asia Pacific (Tokyo), allowing you to host your app near your users for faster performance.
All major cloud providers use “Region” to mean a distinct geographic area that contains one or more isolated data center locations (often called Availability Zones). You choose a region to place resources close to users, meet data residency needs, and design for resilience.