What is apply update from sd card ne demek?

"Apply update from sd card" is an option on Android devices that allows users to install system updates or other software updates directly from a compatible SD card. This feature is useful for users who may not have a stable or fast internet connection to download updates over-the-air. To use this feature, users need to first download the update file onto a compatible SD card, insert the card into their device, and then select the "Apply update from sd card" option from the device's recovery menu to initiate the installation process. It is important to note that using the "Apply update from sd card" feature can cause data loss or other issues if not done properly, so users should read and follow the instructions carefully.