擁有管理權限可以做什麼？
As well as the files that you create, your computer has a number of files which are needed by the system for it to work properly. If these important system files are changed incorrectly they can cause various things to break, so they are protected from changes by default. Certain applications also modify important parts of the system, and so are also protected.
The way that they are protected is by only allowing users with administrative privileges to change the files or use the applications. In day-to-day use, you will not need to change any system files or use these applications, so by default you do not have administrative privileges.
Sometimes you need to use these applications, so you may be able to temporarily get administrative privileges to allow you to make the changes. If an application needs administrative privileges, it will ask for your password. For example, if you want to install some new software, the software installer (package manager) will ask for your administrator password so it can add the new application to the system. Once it has finished, your administrative privileges will be taken away again.
Administrative privileges are associated with your user account. Administrator users are allowed to have these privileges while Standard users are not. Without administrative privileges you will not be able to install software. Some user accounts (for example, the “root” account) have permanent administrative privileges. You should not use administrative privileges all of the time, because you might accidentally change something you did not intend to (like delete a needed system file, for example).
In summary, administrative privileges allow you to change important parts of your system when needed, but prevent you from doing it accidentally.
「超級使用者」是什麼意思？
A user with administrative privileges is sometimes called a superuser. This is simply because that user has more privileges than normal users. You might see people discussing things like su and sudo; these are programs for temporarily giving you “superuser” (administrative) privileges.
為何管理權限可以做很多事？
使用者需擁有管理權限才能對系統進行重大更動，透過權限控管能降低系統遭到有意或無意破壞的可能性。
倘若您隨時都以管理權限來操作系統的話必須格外小心，尤其在您更動重要檔案或是執行應用程式時，稍有不慎都可能造成系統錯誤。建議您只有在必要時才去使用管理權限，以降低操作失誤風險。
基於安全考量，管理權限僅能授予特定且受信任的使用者，以此來避免電腦遭他人破壞。如未妥善控管權限，擁有權限的人可以進行：將您所需的應用程式移除、安裝您不需要的程式、對重要的檔案進行更動等動作。