After connecting my device for data transfer the device asks for mode of USB transfer MTP or PTP.
I googled it and found that MTP(Media transfer protocal ) and PTP(Picture Transfer Protocol) are some sort of protocols for data transfer but didn't get why is it been used as we can transfer data easily with the previous USB mode as an external storage device.
The new USB device modes is somewhat complex for me to understand as I am used to data transfer only as an external storage device but not any PTP or MTP.
Which mode is suitable for what kind of data transfer?