Download is to "take" a file originally stored on the Internet and copy it to your computer. Since it is "copying", that is to say, there is no difference at all, which is an important feature of downloading. As for what files can be downloaded, there are many kinds, such as pictures, flash animations, gif animations, music, and software used as tools. There are several minimum conditions to achieve the purpose of downloading: first, there is this file on the network, and you can find out where it is; Secondly, the website where this file is stored allows you to download it, and you find the entrance to download it; Third, you have download tools (software) to download such files.

Screenshot is to cut the pictures you see on the computer screen with a screenshot software such as scissors and save them in your computer. Since it was cut with scissors, it can't be exactly the same as the original document. There may be something on its edge more or less, but its main part is the same. This is a big difference between screenshot and download. It is precisely because of this difference that it is a very important principle not to take screenshots when downloading. In other words, if you see a picture you like, but you can't download it, you can cut it off by taking a screenshot. The second difference is that the pictures "cut" from screenshots are not limited to all on the Internet, but can also exist in your computer.