OEM stands for Original Equipment Manufacturer which was introduced in Android devices after the Android Lollipop update. The OEM unlocking Android is important for you if you want to unlock your device’s bootloader. After unlocking the device’s bootloader, you can root it, and customer ROMs for better performance. Most importantly, the OEM unlock doesn’t cause damage to your android phone.
The Bootloader is an operating system that resides in storage and needs to be loaded into the memory before use. When your device starts, its memory does not have programs for accessing components such as I/O devices or storage.
On the other side, the Fastboot OEM unlock means turning on a special switch that helps you in unlocking the bootloader by using fastboot commands. The Bootloader and OEM unlock are inter-related as you need to perform the OEM unlock to unlock the device’s bootloader. Without enabling OEM unlock, your device might not process the bootloader unlocking command. Most importantly, OEM unlock does not harm your android device. With bootloader unlock, you can enjoy additional features on your phone. Most importantly, you can add a custom ROM, kernel, and root your device for easy customization.