While downloading is receiving a file from another computer, uploading is the exact opposite. It is sending a file from your computer to another system. Pretty straight forward. It is possible to upload and download at the same time, but it may cause slower transfer speeds, especially if you have a low bandwidth connection. Because most files are located on Internet servers, people generally do a lot more downloading than uploading.
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This page contains a technical definiton of Upload. It explains in computing terminology what Upload means and is one of many Internet terms in the TechTerms dictionary.
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