What is the built in memory fixed by the manufacturer?

The built-in memory fixed by the manufacturer, often referred to as internal storage or onboard memory, is the amount of non-expandable storage allocated for a device's operating system, applications, and user data. This memory is predetermined during the manufacturing process and cannot be altered by the user. It varies across devices and can impact performance and user experience, as limited memory may restrict the number of apps and data a user can store.