In the free software community, binary blob is a pejorative term for an object file loaded into the kernel of a open source operating system without publicly available source code. The term is not usually applied to code running outside the kernel, such as BIOS code, firmware images, or userland programs.

When computer hardware vendors provide complete technical documentation for their products, operating system developers are able to write hardware device drivers to be included in the operating system kernels. However, some vendors, such as NVIDIA, do not provide complete documentation for some of their products and instead provide binary-only drivers (binary blobs); this practice is most common for accelerated graphics drivers, networking devices and RAID controllers.

Some projects try to create a free operating system, and will not accept binary blobs if they cannot get documentation for hardware or source code for device drivers. Such projects include NetBSD, FreeBSD, DragonFly BSD, and most GNU/Linux distributions.

Zach Pfeffer (born January 6, 1995 in Dresher, Pennsylvania) is an American soccer player who currently plays as a midfielder for the Philadelphia Union of Major League Soccer.

Pfeffer played for FC Delco along with montgomery maniacs as a young lad in Pennsylvania before spending a semester at the U-17 national team residency in 2010. He then spent several months training with the Philadelphia Union first team and made an appearance for them in a friendly against C.D. Guadalajara on September 1, 2010. On December 22, 2010, the Philadelphia Union signed Pfeffer as their first ever "home-grown" player. "Midfielder Zach Pfeffer was signed as the Union’s first Homegrown Player at the age of 15. Pfeffer became the first player to join the 2010 expansion team from the MLS Homegrown Player initiative, a program started in 2006 designed to provide increased opportunities for local players. Each MLS team may sign players from their respective youth development programs without subjecting those players to the MLS SuperDraft. Born January 6, 1995, Pfeffer is the fourth youngest player ever to sign an MLS contract, behind Freddy Adu, Fuad Ibrahim, and recently signed New England Revolution Homegrown Player Diego Fagundez.