The Samsung Galaxy S4 is an Android smartphone produced by Samsung Electronics as the fourth smartphone of the Samsung Galaxy S series and was first shown publicly on March 14, 2013, at Samsung Mobile Unpacked in New York City.
It is the successor to the Galaxy S III, which maintains a similar design, but with upgraded hardware and an increased focus on software features that take advantage of its hardware capabilities, such as the ability to detect when a finger is hovered over the screen, and expanded eye tracking functionality, it was released the previous year.
The phone's successor, the Samsung Galaxy S5, was released the next year.