Software designed to function on the Android operating system that facilitates the routing of network traffic through an intermediary server, potentially altered or customized from its original form, and distributed as an Android Package Kit (APK). This type of software can enable users to mask their IP address, bypass geo-restrictions, or access content that might otherwise be unavailable on their network. An example would be an application installed on a smartphone that redirects all internet traffic through a server located in a different country, creating the illusion of the user being located in that country.
The relevance of such applications stems from various factors, including enhanced privacy, improved security in certain situations, and the circumvention of censorship. Historically, the need for these tools arose from increased internet surveillance and restrictions imposed by governments or organizations. However, it is important to note that the use of modified applications can carry security risks, as the integrity of the software may be compromised.