This article is about the bumps on LEGO bricks. For the part commonly referred to as a stud, see Part 4073.

Studs are small, cylindrical bumps that are on top of most LEGO bricks that hold together the brick above it. All studs of LEGO Bricks have the word "LEGO" printed on them. Not all LEGO bricks have studs, there are some which have smooth sides and are stud-less (yet these pieces will still bear the word LEGO)."Stud" is also some times used as a unit of measurement. Example: 2x4 means two studs wide and four studs long.

Studs are the basis of all LEGO systems, and is used extensively in storylines by the Minifigures, a stud for them can be:

Currency

Unit of measurement

Basis of written Minifigure language

Used on the Message Boards to show where a user ranks

In Video Games

The stud is used in LEGO Star Wars: The Video Game, LEGO Star Wars II: The Original Trilogy, LEGO Star Wars: The Complete Saga, LEGO Star Wars III: The Clone Wars, LEGO Indiana Jones: The Original Adventures, LEGO Indiana Jones 2: The Adventure Continues, BIONICLE Heroes, LEGO Batman: The Video Game, LEGO Batman 2: DC Super Heroes, LEGO Harry Potter: Years 1-4, LEGO Harry Potter: Years 5-7, LEGO The Lord of the Rings: The Video Game, LEGO City Undercover, LEGO Marvel Super Heroes, The LEGO Movie Video Game, and LEGO The Hobbit: The Video Game. Studs serve as "token" items, as they are constantly found in every level of the game. They are used to buy new things in the shop of each game (in Dexter's Diner in LEGO Star Wars: The Video Game, Mos Eisley Cantina in LEGO Star Wars II: The Original Trilogy and LEGO Star Wars: The Complete Saga, Barnett College in LEGO Indiana Jones: The Original Adventures, Balta's store in BIONICLE Heroes, the Batcave and Arkham Asylum in LEGO Batman: The Video Game, Diagon Alley in LEGO Harry Potter: Years 1-4, and Middle-earth overworld in LEGO the Lord of the Rings: The Video Game.) The studs are actually bricks known as "pips": round 1x1 plates. Silver studs are worth 10, golden studs are worth 100, blue studs are worth 1,000, and purple studs are worth 10,000. In addition, LEGO the Lord of the Rings: The Video Game adds light-blue guide studs that a player follows to their objective (overworld only).