Internal memory is the memory where all the data of the mobile device is stored, the operating system, applications, photos, videos, music, chats, are stored in this memory so it is important to know if the device we are going to buy has of enough storage space for our needs.
The internal memory in mobile devices is equivalent to the hard drive in computers.
128 GB of internal memory can be considered a minimum amount if we want our device to last at least two years and if we take photos and videos frequently.
It must be taken into account that mobile phones and tablets increasingly take photos and videos with higher resolution so they increasingly occupy more space on our device.
Even with 128GB it may be necessary to use a cloud storage service like Google Photos, iCloud Drive, or Amazon Cloud Drive.
128 GB of internal storage has been the minimum amount available for the new iPhone 13 so Apple already establishes it as the minimum sufficient for its devices due to the space occupied by the images and videos captured by its multiple cameras.