A ball grid array (BGA) is a type of surface-mount packaging used for integrated circuits. Ball-grid array packages are used to permanently mount devices such as microprocessors. A BGA can provide more interconnection pins than can be put on a dual in-line or flat package. The whole bottom surface of the device can be used, instead of just the perimeter. The leads are also on average shorter than with a perimeter-only type, leading to better performance at high speeds. Soldering of BGA devices requires precise control and is usually done by automated processes. A BGA device is never mounted in a socket in use.

The BGA is descended from the pin grid array (PGA), which is a package with one face covered (or partly covered) with pins in a grid pattern. These pins conduct electrical signals from the integrated circuit to the printed circuit board (PCB) on which it is placed. In a BGA, the pins are replaced by balls of solder stuck to the bottom of the package. These solder spheres can be placed manually or with automated equipment. The solder spheres are held in place with a tacky flux until soldering occurs. The device is placed on a PCB with copper pads in a pattern that matches the solder balls. The assembly is then heated, either in a reflow oven or by an infrared heater, causing the solder balls to melt. Surface tension causes the molten solder to hold the package in alignment with the circuit board, at the correct separation distance, while the solder cools and solidifies.

Keith Cozart (born August 15, 1995)^{[citation needed]}, better known by his stage name Chief Keef is an American rapper from Chicago, Illinois. He has signed a major record deal with Interscope Records, and is the CEO of his own record label Glory Boyz Entertainment.

Keith Cozart was born in Chicago, Illinois, on August 15, 1995.^{[citation needed]} He attended Dulles Elementary School and later Banner High School on the city's South Side. In December 2011, Cozart was arrested on a weapons charge (aggravated unlawful use of a weapon) and put under house arrest at his grandmother’s home.

While under house arrest, Cozart released videos on Youtube. The attention he received grew in the short time between the release of several mixtapes and several of music videos, including 'Bang', '3Hunna' and 'I Don’t Like'. After two locally successful mixtapes, his song 'I Don’t Like' became a local hit in Chicago. It also caught fellow Chicago rapper Kanye West's attention who organized a remix of the song along with Pusha T, Jadakiss and Big Sean. Keef will soon be releasing his third mixtape Finally Rich in which Waka Flocka, Young Jeezy, Yo Gotti and fellow GBE members are to be featured. An interview with Keef is slated to appear as part of an upcoming feature on Chicago artists in Spin Magazine. On July 7, 2012, it was announced that Chief Keef would be performing at Lollapalooza 2012, an annual music festival held in Grant Park, Chicago, IL.