File transfer protocol is the standard protocol used for transferring files between a client and a server. This protocol is simple and straightforward which helps reduce transfer time. FTP also utilizes an out-band protocol where the control and data transfer channels are separated. Unlike HTTP, the control and data channels are in one channel. The server needs to wait for the control signal to finish before receiving the data bits.
FTP is commonly used in online file storage service. This service allows you to back up personal files or share large files with other people. Most people use email for sending files. However, email service has a 10MB limitation for attachments. This can be a hassle especially if you need to send files several gigabytes in size. You can use file data storage mediums like discs and USB drives but it would take a while for them to be received. Online file hosting lets you send a download link so other people can download the files instantly.
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