In the United States, the Recording Industry Association of America (RIAA) awards certification based on the number of albums and singles sold through retail and other ancillary markets. Other countries have similar awards (see music recording certification). Certification is not automatic; for an award to be made, the record label must first request certification. The audit is conducted against net shipments after returns (most often an artist's royalty statement is used), which includes albums sold directly to retailers and one-stops, direct-to-consumer sales (music clubs and mail order) and other outlets. From Wikipedia
