WorldInbox is a free education app that provides video lectures for competitive exams like the University of Pennsylvania (Penn), Georgetown University (Gts), the Police Institute (Pis), the Air Force Academy (Aya), the United States Naval Academy (USNA), the National Security Agency (NSA), the Central Intelligence Agency (CIA), the Department of Homeland Security (DHS), the Federal Security Agency (FSAP), the National Park Service (NPS), the United States Air Force (USAF), the United States Army (USAR), the National Guard (USNG), and others.

The video lectures are provided by over 20 of the best teachers in the country. Each video lecture is 5-10 minutes long and covers the content of the corresponding exam.

The lectures are provided in two ways:

The first is by watching the video lecture and clicking the play button to start the video. The second is by downloading the video to your device and watching it later.

If you are studying to get a competitive exam, WorldInbox will be an important part of your studying.