Definition - What does Download (D/L) mean?
Download (D/L) is the process of receiving data from a central server to a user’s computer. The source can be a Web server, FTP server, email server or other similar system.
Download also refers to the copying of data from a main source to a computer.
Techopedia explains Download (D/L)
Download refers to receiving and saving, rather than just receiving, because the information received from a remote server is saved to a local computer but can only be used when data has been fully received in its entirety. The term is most often mistaken and confused with the term "transferring," which is the sending and receiving of data between storage devices - completely different than downloading.
Content, like streaming YouTube media, cannot be downloaded to a local system. Websites place restrictions on users trying to download such content, usually displaying a message stating, "Downloading is not permitted."