Downloading and installing are two different processes when it comes to using a computer. Downloading is the process of copying a file from a remote computer to the one you are working on. This file can be anything from a program to an image or document. Installing, on the other hand, is the process of setting up the file you have downloaded on your computer.
It is the process of making the file usable and ready for use. When you are downloading a file, you will usually be given two options: save or execute. If you choose to save, the file will be stored in your computer's memory and nothing else will happen. If you choose to execute, the file will be downloaded and then installed automatically.
In some cases, the installation process requires an additional program to be downloaded in order to complete the installation. This program is usually small and will return to the web to download the files needed for installation. It is important to understand that downloading and installing are two separate processes. Downloading is simply copying a file from one computer to another, while installing is setting up that file so that it can be used on your computer.
Knowing this difference can help you better understand how to use your computer.