What is a Slingbox primarily used for?

A Slingbox is primarily used as a streaming device that allows users to remotely view their television content over the internet. It captures live television signals from a cable or satellite box and then streams that content to various devices such as smartphones, tablets, or computers, enabling users to watch their favorite shows and sports from virtually anywhere with an internet connection. This technology is particularly advantageous for those who travel frequently, as it provides convenient access to live television programming outside of the home network.

The other choices do not accurately capture the main function of a Slingbox. Recording audio signals is not relevant, as Slingbox is not focused on audio-only content. A cable signal booster relates to amplifying signals to improve quality and strength, which is outside the scope of what a Slingbox does. Similarly, a digital television receiver is primarily designed to convert digital signals for display, rather than facilitating remote streaming capabilities. Thus, the correct answer highlights the Slingbox's unique function in enabling users to view their television content remotely.