In computer networks, free download means to receive data to a local system from a remote system, or to initiate such a free download data transfer. Examples of free download from which a download might be performed include a webserver, email server, or other similar systems, free download can mean either any free file that is offered for downloading or that has been downloaded, or the process of receiving such a file.
The inverse operation, free download can refer to the sending of data from a local system to a remote system such as a server or another client with the intent that the remote system should store a copy of the free download data being transferred, or the initiation of such a process. The words first came into popular usage among computer users with the increased popularity.
The use of the terms uploading free download and downloading often imply that the data sent or received is to be stored permanently, or at least stored more than temporarily, the term downloading is distinguished from the related concept of streaming, which indicates the receiving of data that is used near immediately as it is received, while the transmission is still in progress and which may not be stored, whereas in a process described using the term downloading, this would imply that the data is only usable when it has been received in its entirety.
Increasingly, websites that offer streaming media or media displayed, and which place restrictions on the ability of users to save these materials to their computers after they have been received, say that downloading is not permitted. In this context, download implies specifically receive and save.
When applied to local transfers, it is often difficult to decide if it is an upload or download, as both source and destination are in the local control of the user, if the user uses the receiving device to initiate the transfer then it would be a download and if they used the sending device to initiate it would be an upload, as most non technical users tend to use the term download to refer to any data transfer, the term sideload is sometimes being used to cover all local to local transfers to end this confusion.
half life is the period of time it takes for a substance undergoing decay to decrease by half life. The half life originally was used to describe a characteristic, but may apply to any half life. The original term half life, dating to 1907, was half life period, which was later shortened to half life sometime in the early 1950s.
half life are very often used to describe quantities undergoing exponential decay radioactive decay where the half life is constant over the whole life of the decay, and is a characteristic unit for the exponential decay equation, a half life can also be defined for non exponential decay processes, in these cases the half life varies throughout the decay process. For a general introduction and description of exponential decay. The converse of half life is doubling time.
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