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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Sometimes programmers build software with existing building blocks, kind of like you can build a LEGO set. On Windows and Linux, these building blocks need to be placed in the correct location for the software to find and use them. On macOS, these building blocks are bundled inside the program and you *can* just download the file or boot it from disc.
Another benefit to copying the program from the disc to your computer is loading speed. For example, something like a game can be very large, and you would have to wait for the the disc drive to read media to play the game. When it’s installed onto your local drive, the computer can load the data much faster.
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