Third-party applications are software programs developed by companies or individuals that are not the original creators of the platform they run on. For example, if you use a smartphone, the apps you download from the app store that are not made by the phone's manufacturer are considered third-party applications. They can enhance the functionality of the device or provide additional features. These applications can be found on various platforms, including Windows, macOS, iOS, and Android. Users often choose third-party applications for their unique features, customization options, or to fulfill specific needs that the default applications do not address.