This starts the download process, and you can choose not to know any more about it than that. There are some file format and compatibility issues you should bear in mind when downloading files. Usually any downloaded file is in a compressed form which needs to be decompressed before it can be used. Some files expand automatically after downloading, while others require special decompressing software which must be on your computer. Often this is supplied with your browser application.
Most files require some type of encoding before they can be transmitted over the Internet.
Often encoding and decoding are done automatically. You should remember that different types of computers are used on the Internet. Therefore, before you download a file you should try to make sure that it is compatible with the hardware and software on your computer. If you are downloading a Macintosh Microsoft Word document onto your PC, for example, you will probably need Word for Windows to open the file. One way around this is to use a multi-platform file format.