"Scrap" can also refer to source material used in graphic design.

thumb|left|Piles of scrap metal being utilized for the World War II effort, circa 1941.

Scrap is a term used to describe recyclable materials left over from every manner of product consumption, such as parts of vehicles, building supplies, and surplus materials. Often confused with waste, scrap in fact has monetary value. In 2007 the United States' exported over 10 billion dollars worth of scrap steel.

Overall, the scrap industry processes more than 145 million tons of recyclable material each year into raw material feedstock for industrial manufacturing around the world. The industry contributed $65 billion in 2006 and is one of the few contributing positively to the U.S. balance of trade, exporting $15.7 billion in scrap commodities in 2006. This imbalance of trade has resulted in rising scrap prices during 2007 and 2008 within the United States. Scrap recycling also helps reduce greenhouse gas emissions and conserves energy and natural resources. For example, scrap recycling diverts 145 million tons of materials away from landfills. Recycled scrap is a raw material feedstock for 2 out of 3 pounds of steel made in the U.S., for 60% of the metals and alloys produced in the U.S., for more than 50% of the U.S. paper industry's needs, and for 33% of U.S. aluminum. Recycled scrap helps keep air and water cleaner by removing potentially hazardous materials and keeping them out of landfills.

Scrap is often taken to a wrecking yard (also known as a scrapyard, junkyard, or breaker's yard), where it is processed for later melting into new products. A wrecking yard, depending on its location, may allow customers to browse their lot and purchase items before they are sent to the smelters although many scrap yards that deal in large quantities of scrap usually do not, often selling entire units such as engines or machinery by weight with no regard to their functional status. Customers are typically required to supply all of their own tools and labor to extract parts, and some scrapyards may first require waiving liability for personal injury before entering. Many scrapyards also sell bulk metals (stainless steel, etc) by weight, often at prices substantially below the retail purchasing costs of similar pieces.

In contrast to wreckers, scrapyards typically sell everything by weight, rather than by item. To the scrapyard, the primary value of the scrap is what the smelter will give them for it, rather than the value of whatever shape the metal may be in. An auto wrecker, on the other hand, would price the exact same scrap based on what the item does, regardless of what it weighs. Typically, if a wrecker cannot sell something above the value of the metal in it, they would then take it to the scrapyard and sell it by weight. Equipment containing parts of various metals can often be purchased at a price below that of either of the metals, due to saving the scrapyard the labor of separating the metals before shipping them to be recycled. As an example, a scrapyard in Arcata, California sells automobile engines for $0.25 per pound, while aluminum, of which the engine is mostly made, sells for $1.25 per pound. Scrap prices are reported in a handful of U.S. publications, including American Metal Market, based on confirmed sales.