The PS4 was released on November 15, 2013 in the US. Global release dates listed below:

Playstation Release Dates

PS1 - Released December 3, 1994 - Sold 102.49 million units
PS2 - Released March 4, 2000 - Sold 155 million units
PS3 - Released November 11, 2006 - Sold over 80 million units
PS4 - Released November 15, 2013 - Millions and counting
PS4 Pro Release Date
PS5 - Release Date! - (The PS5 is confirmed and in development)