Applications are tools built by software developers to use the computing power of the computer to aid the user to accomplish tasks. Millions of distinct applications run on Windows every day. Windows 10 comes with a default set of apps, such as Mail, Photos, and WordPad, all developed by Microsoft. Millions of other applications are available to run on your computer by installing them via physical media like CDs/DVDs, downloading from the internet, or Microsoft store, or creating your own. Windows 10 permits applications to have a variety of permissions to run on the computer, so each application varies in its complexity, visual appearance, navigation, and control of the computer. It is important to understand and know what type of application you are installing on your computer as some applications (known as viruses) install software that is harmful to the computer or the user. More will be discussed in Chapter 6; Security. To improve security, Microsoft has created the Windows Store, which allows the user to view and download applications that have been reviewed and deemed safe for the end-user.