ELI5- Why do I have to install a programm on a computer. Why can’t I just use it as I download the file or boot it from the disc?
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Some programs can be used just like that. However, most programs you do have to install. One reason is that the program is compressed. The installer is much smaller than the actual program, which saves a lot of space. In addition, the program will interact with parts of your operating system, so that all needs to be configured. If you want to have start menu shortcuts, context menu integration, notifications etc those things require the program to be integrated into your operating system. There are many services like that of the OS the program needs to know, such as services that help it communicate over the internet, read and write files on your hard disk. Those are things that the program can not do without the help of the OS.
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